Chapter 25 Exercises
How to use these exercises: Work through the parts in order. Part A builds recognition skills, Part B develops analysis, Part C applies concepts to your own domain, Part D requires synthesis across multiple ideas, Part E stretches into advanced territory, and Part M provides interleaved practice that mixes skills from all levels.
For self-study, aim to complete at least Parts A and B. For a course, your instructor will assign specific sections. For the Deep Dive path, do everything.
Part A: Pattern Recognition
These exercises develop the fundamental skill of recognizing the adjacent possible across domains.
A1. For each of the following innovations, identify (i) at least three preconditions that had to be met before the innovation could enter the adjacent possible, (ii) whether there is evidence of simultaneous invention, and (iii) one room that the innovation opened -- a new possibility that became adjacent only after this innovation existed.
a) The printing press (Gutenberg, c. 1440)
b) Photography (Daguerre and Fox Talbot, c. 1839)
c) The internet (ARPANET, 1969; World Wide Web, 1991)
d) Antibiotics (Fleming's discovery of penicillin, 1928; mass production, 1943)
e) Rap music (originating in the South Bronx, mid-1970s)
f) The podcast (emerging c. 2004-2005)
g) The limited liability corporation (developing in England, mid-nineteenth century)
h) Sushi in Western countries (spreading from the 1960s onward)
A2. Classify each of the following as (a) a premature idea, (b) an innovation that arrived when its adjacent possible was ready, or (c) a case of simultaneous invention. Justify your classification.
a) Leonardo da Vinci's tank design (c. 1487)
b) The discovery of oxygen by Carl Wilhelm Scheele, Joseph Priestley, and Antoine Lavoisier (1772-1778)
c) Charles Babbage's Analytical Engine (1837)
d) The independent development of writing systems in Mesopotamia, Egypt, China, and Mesoamerica
e) The first solar cell (Bell Labs, 1954)
f) Gregor Mendel's theory of genetic inheritance (1866, ignored until rediscovered in 1900 by three independent researchers)
g) The smartphone (multiple companies, 2006-2008)
h) Gene editing with CRISPR (multiple labs, 2012-2013)
A3. For each of the following constraints, explain how the constraint focused creative exploration and expanded the adjacent possible in a specific direction.
a) The 140-character limit on early Twitter
b) The Hays Code censorship rules in Hollywood films (1934-1968)
c) The prohibition on instruments in early a cappella vocal traditions
d) The limited palette of ingredients available in prison cooking
e) The requirement that haiku contain exactly 5-7-5 syllables (in the English adaptation)
f) The restricted color palette in early video game graphics (e.g., the NES could display only 54 colors on screen at once)
A4. The chapter argues that the eye evolved independently at least forty times because the adjacent possible of optics channels all lineages through similar design stages. Identify three other biological structures or systems that have evolved convergently and explain how the adjacent possible of physics, chemistry, or ecology channeled independent lineages toward similar solutions.
A5. Map the adjacent possible for a specific culinary tradition you know well. Identify:
a) The core ingredients and techniques that define the tradition.
b) A fusion innovation that emerged when this tradition met another tradition. What preconditions had to be met?
c) A culinary innovation that was "premature" -- an attempt at fusion or novelty that failed because the audience or the infrastructure was not ready.
d) A constraint within the tradition (dietary laws, seasonal availability, limited ingredients) that focused exploration and produced distinctive innovations.
Part B: Analysis
These exercises require deeper analysis of adjacent possible patterns.
B1. The Precondition Audit. Choose a major innovation from the past fifty years (it can be technological, cultural, legal, scientific, or artistic). Conduct a precondition audit:
a) List every precondition you can identify -- technological, cultural, economic, institutional, intellectual -- that had to be met before this innovation could enter the adjacent possible.
b) For each precondition, estimate when it was met.
c) Identify the last precondition to be met -- the "final door" that had to open before the innovation became possible.
d) Search for evidence of simultaneous invention. Were others working on the same idea at roughly the same time?
e) Identify the "rooms" that the innovation opened -- the new possibilities that became adjacent only after this innovation existed.
B2. Path Dependence Analysis. Choose one of the following cases of technological lock-in and analyze the path dependence:
- The QWERTY keyboard layout
- The internal combustion engine in automobiles
- The 60 Hz / 120V electrical standard in the United States (vs. 50 Hz / 230V in Europe)
- The dominance of the x86 processor architecture in personal computers
- The standard railway gauge (4 feet 8.5 inches)
For your chosen case:
a) Trace the historical path that led to this standard becoming dominant. Identify the key decision points where a different choice could have led to a different outcome.
b) Assess the costs of the current lock-in. Who bears these costs? Are they significant?
c) Identify any attempts to break the lock-in and explain why they succeeded or failed.
d) Evaluate whether the lock-in is an example of an inferior technology becoming entrenched, or whether the current standard is "good enough" that the costs of switching outweigh the benefits of the alternative.
e) What does this case teach about the relationship between path dependence and the adjacent possible?
B3. The Premature Idea Diagnostic. Consider a current idea or technology that you believe is premature -- something that is conceptually sound but whose adjacent possible is not yet ready. (Examples might include brain-computer interfaces for general use, fusion power, fully autonomous vehicles, or something from your own field.)
a) State the idea clearly and explain why it is conceptually sound.
b) Identify the preconditions that are not yet met -- the rooms that must be entered before this idea can be realized.
c) Estimate when each precondition might be met, based on current trajectories.
d) Predict what will happen when the last precondition is met. Will the innovation emerge simultaneously from multiple sources? Why or why not?
e) Identify the risks of "premature deployment" -- attempting to implement the idea before the adjacent possible is ready.
B4. Constraints as Enablers -- Design Challenge. Choose a creative domain (writing, music, visual art, cooking, game design, software design, or another domain you know well) and design a constraint-based creative exercise:
a) Define a specific, non-trivial constraint (not "write a haiku" -- something original).
b) Explain why the constraint will focus exploration on dimensions that produce interesting results.
c) Try the exercise yourself and report what happened. Did the constraint produce innovations you would not have discovered without it?
d) Analyze the mechanism: how did the constraint change your adjacent possible? What dimensions did it close off, and what dimensions did it open up?
Part C: Application to Your Own Domain
These exercises connect the adjacent possible to your area of expertise.
C1. Identify the adjacent possible of your field right now. What innovations are "one room away" from current practice? Specifically:
a) What preconditions have recently been met in your field (new technologies, new knowledge, new regulations, new cultural shifts)?
b) What innovations do these preconditions make possible that were not possible five years ago?
c) Are you aware of multiple people or groups converging on the same innovation? Is there evidence of simultaneous invention in progress?
d) What is the "last precondition" that is holding back the most important innovation in your field? When do you expect it to be met?
C2. Identify a case of path dependence or lock-in in your field -- a technology, standard, practice, or methodology that persists not because it is optimal but because switching costs are too high.
a) What is the locked-in practice, and what would the superior alternative be?
b) Why did the current practice become dominant? Was it originally the best option, or did contingent factors (timing, marketing, political influence) play a role?
c) What are the costs of the lock-in? Who bears them?
d) Is there a realistic path to breaking the lock-in? What would have to change?
C3. Identify a constraint in your field that functions as an enabler -- a limitation that focuses exploration and produces better results than unconstrained freedom would.
a) Describe the constraint and explain why it might initially appear to be purely limiting.
b) Explain the mechanism by which it channels creative or innovative energy in productive directions.
c) Has anyone in your field proposed removing this constraint? If so, predict what would happen to the quality of innovation if the constraint were removed.
d) Design an additional constraint that you believe would further focus exploration in your field. Explain why.
C4. Has your field experienced a premature idea -- a concept or technology that was proposed before its adjacent possible was ready?
a) Describe the idea and when it was first proposed.
b) Identify the preconditions that were missing at the time of the original proposal.
c) Have those preconditions since been met? If so, has the idea been successfully realized?
d) What lessons does this premature idea offer about the relationship between vision and implementation in your field?
Part D: Synthesis
These exercises require integrating ideas across multiple chapters.
D1. The Adjacent Possible and Tacit Knowledge. Chapter 23 argued that the most important knowledge resists articulation. Chapter 25 argues that innovation depends on preconditions.
a) Is tacit knowledge itself a precondition? Can the adjacent possible be expanded by tacit knowledge that has not been formalized? Give three examples.
b) If tacit knowledge is a precondition for innovation, what happens when an expert with critical tacit knowledge retires or dies? Does the adjacent possible contract? Can rooms that were once open close again?
c) The apprenticeship model transmits tacit knowledge through proximity and practice. How does the adjacent possible framework help explain why apprenticeship persists in innovation-dependent fields -- why you cannot shortcut the transmission of the preconditions?
d) Design a thought experiment that tests whether tacit knowledge can expand the adjacent possible in ways that explicit knowledge cannot.
D2. The Adjacent Possible and the Cobra Effect. Chapter 21 showed how incentives create ecologies of strategic responses.
a) Innovation incentives (patents, prizes, grants, venture capital) shape which parts of the adjacent possible are explored. Apply the cobra effect framework: what perverse incentives might cause the innovation ecology to explore suboptimal paths through the adjacent possible?
b) Patents create a temporary monopoly that rewards innovation. But they also create path dependence -- patented technologies become standards that lock in particular approaches. Analyze the tension: does the patent system help explore the adjacent possible or does it create lock-in that limits future exploration?
c) The chapter discusses the "premature idea." Can incentive systems create "premature deployments" -- technologies pushed into the market before the adjacent possible is ready? Give two real examples and analyze the consequences.
d) Design an innovation incentive system that is resistant to cobra effects while encouraging genuine exploration of the adjacent possible. What would it reward? How would it avoid rewarding gaming?
D3. The Adjacent Possible and Paradigm Shifts. Chapter 24 (if read) explored how scientific paradigms constrain what questions can be asked and what answers are acceptable.
a) How does a paradigm define the adjacent possible of a scientific field? What rooms are "visible" from within a paradigm, and what rooms are hidden?
b) When a paradigm shift occurs, does the adjacent possible expand, contract, or change shape? Use a specific example from the history of science.
c) Kuhn argued that paradigm shifts are not simply the addition of new knowledge but a restructuring of how existing knowledge is organized. How does this connect to the chapter's argument that each innovation changes the set of rooms available to explore?
d) Can a paradigm create a form of intellectual lock-in -- a path dependence in ideas that is analogous to QWERTY in technology? If so, how does the lock-in eventually break?
D4. The Adjacent Possible and Map-Territory Confusion. Chapter 22 explored the dangers of confusing models with reality.
a) Is the concept of the "adjacent possible" itself a map of the territory of innovation? What does it capture well, and what does it miss?
b) Could the adjacent possible framework create its own map-territory confusion -- leading people to believe that innovation is more predictable than it actually is?
c) The chapter distinguishes between convergent innovation (predictable from the structure of the adjacent possible) and contingent innovation (dependent on path and luck). How does this distinction help avoid map-territory confusion when thinking about the future?
Part E: Advanced Challenges
These exercises push beyond the chapter's material into deeper or more speculative territory.
E1. Research Stuart Kauffman's original work on the adjacent possible in the context of the origin of life (his books The Origins of Order and At Home in the Universe). Assess how well the concept transfers from prebiotic chemistry to the domains discussed in this chapter (technology, music, law, cuisine). Are there important differences between biological and cultural adjacent possibles? Does the concept lose explanatory power when applied outside its original domain, or does it gain power?
E2. The economist W. Brian Arthur has argued that technology is fundamentally combinatorial -- that new technologies are built from combinations of existing ones, and this combinatorial process drives the growth of the adjacent possible. Research Arthur's framework (presented in The Nature of Technology, 2009) and compare it with Kauffman's adjacent possible. Do the two frameworks complement each other, or do they offer competing explanations for the same phenomena?
E3. The sociologist Robert K. Merton coined the term "multiple discovery" to describe the phenomenon of the same scientific discovery being made independently by multiple researchers at roughly the same time. Research Merton's work and assess his explanation for the phenomenon. How does Merton's sociological explanation complement or conflict with the adjacent possible framework?
E4. Path dependence theory has been critiqued by economists who argue that markets are efficient enough to break lock-in when the costs are sufficiently high. Research the debate between Paul David (who argues for strong path dependence in the QWERTY case) and Stan Liebowitz and Stephen Margolis (who argue that the QWERTY story is a myth and that markets are self-correcting). Assess the evidence on both sides. Does the adjacent possible framework help resolve this debate?
E5. Design a research study to test the adjacent possible hypothesis in a specific domain. Your study should:
a) Define a measurable prediction derived from the adjacent possible framework (e.g., innovations that require fewer unfulfilled preconditions will be discovered sooner than those requiring many; innovations with many fulfilled preconditions will show more simultaneous invention).
b) Identify a dataset that could test this prediction.
c) Specify your methodology and analysis plan.
d) Identify the limitations of your study and the alternative explanations you would need to rule out.
Part M: Mixed Practice (Interleaved Review)
These exercises mix concepts from Chapters 21-25 to build integrated understanding.
M1. A pharmaceutical company discovers a promising new antibiotic. Analyze this situation using concepts from Chapters 21-25:
a) Adjacent possible (Ch. 25): What preconditions had to be met for this discovery? Was the discovery likely simultaneous (are other labs working on similar compounds)?
b) Cobra effect (Ch. 21): The company will patent the antibiotic and price it to recover R&D costs. How might the patent system create cobra effects in antibiotic development? Consider the incentive to develop antibiotics for chronic use rather than acute infections.
c) Tacit knowledge (Ch. 23): The lead researcher has decades of experience in medicinal chemistry. How much of her contribution is tacit knowledge that cannot be transferred through the patent document? What happens to the adjacent possible if she retires?
d) Map-territory (Ch. 22): The clinical trial results are a map of the antibiotic's effectiveness. What does the map capture, and what territory does it miss (real-world usage patterns, resistance evolution, patient compliance)?
e) Path dependence (Ch. 25): Once this antibiotic becomes the standard of care, what lock-in effects might it create? How might it shape the adjacent possible of future antibiotic development?
M2. A government announces a major investment in renewable energy innovation. Using concepts from Chapters 21-25, analyze the program:
a) What is the current adjacent possible for renewable energy? What preconditions have recently been met, and what preconditions remain unfulfilled?
b) How might the investment create cobra effects? What perverse incentives might emerge from the grant structure?
c) Is there a risk of premature deployment -- pushing technologies into the market before the adjacent possible is ready (e.g., grid storage, hydrogen infrastructure)?
d) How might the investment create path dependence? If the funding favors one technology (e.g., solar) over another (e.g., nuclear fusion), how might this early choice shape the long-term trajectory of the energy system?
e) What tacit knowledge is required for the innovation program to succeed? Is the program investing in apprenticeship and mentoring, or only in explicit research outputs (papers, patents, prototypes)?
M3. A music streaming platform uses AI to generate playlists and recommend music. Analyze this system through the lens of Chapters 21-25:
a) How does the recommendation algorithm shape the musical adjacent possible for listeners? Does it expand it (by introducing listeners to music they would not have found otherwise) or contract it (by reinforcing existing preferences)?
b) How might the algorithm create a cobra effect? If artists are incentivized by the algorithm's metrics (streams, saves, playlist additions), what kind of music will be optimized for? Will this expand or contract the musical adjacent possible?
c) The algorithm is a map of musical taste. What territory does it miss? What dimensions of musical experience (live performance, social context, lyrical meaning, cultural significance) are absent from the algorithm's model?
d) Is there a risk of lock-in? If the algorithm shapes what music is created, does it create path dependence that narrows the future of music?
e) How does tacit knowledge operate in music recommendation? A skilled record store clerk (now a vanishing species) had tacit knowledge of customers and music that no algorithm captures. What is lost?
M4. A law firm adopts AI-powered legal research tools that can identify relevant precedents faster than human researchers. Analyze using Chapters 21-25:
a) How does this tool change the legal adjacent possible? Does faster access to precedent expand the space of possible legal arguments?
b) What tacit knowledge does the AI tool not capture? What dimensions of legal reasoning (strategy, client relationship, courtroom presence, judicial temperament reading) remain tacit?
c) Could the tool create a cobra effect? If lawyers are incentivized to cite more precedents (because the AI makes it easy), does the quantity of citations improve or degrade the quality of legal argument?
d) Is there a risk of path dependence? If all lawyers use the same AI tool with the same training data, will legal reasoning converge in ways that narrow the adjacent possible of future legal innovation?
e) Apply the map-territory distinction: the AI's model of legal relevance is a map. What territory does it miss?
M5. Design a "Innovation Adjacent Possible Assessment" for an organization. The assessment should:
a) Identify the current adjacent possible of the organization -- the innovations that are one step away from current capabilities, resources, and knowledge.
b) Assess whether the organization's incentive structure encourages genuine exploration of the adjacent possible or creates cobra effects that reward gaming over innovation.
c) Evaluate whether the organization's knowledge-transfer mechanisms (mentoring, apprenticeship, documentation) preserve the tacit knowledge that serves as preconditions for innovation.
d) Check for path dependence and lock-in -- technologies, processes, or standards that persist because of switching costs rather than merit.
e) Assess whether the organization's constraints (budget, timeline, regulations) are functioning as enablers (focusing exploration) or as genuine limitations (preventing exploration).
f) Include a meta-assessment: is this assessment itself a map that might be confused with the territory of innovation?