Key Takeaways: Visualization Gallery

  1. The gallery is a reference, not a textbook. Browse by question category, find the chart type that fits, copy the code, adapt to your data. Do not read linearly; look up what you need when you need it.

  2. 50 chart types across 9 categories. Comparison (8), Composition (6), Distribution (8), Relationship (6), Trend (6), Geospatial (5), Flow/Network (5), Part-to-Whole/Ranking (3), Specialized (3). Each category answers a specific kind of question.

  3. Each entry has a consistent structure. Name, when to use, when NOT to use, data requirements, library recommendation, code template, design tips. The structure lets you evaluate and produce any chart type quickly.

  4. The quick-reference decision table is the fastest lookup. Section 35.11 maps question types to chart types in a single table. Start there when you are unsure which chart type fits.

  5. New chart types in this chapter. Lollipop, dumbbell, slope, bump, waffle, waterfall, Marimekko, candlestick, radar, gauge, alluvial — chart types not covered in earlier chapters but useful for specific situations.

  6. Every code example is self-contained. Copy, paste, run. No external dependencies beyond the standard libraries (matplotlib, seaborn, Plotly, Altair). Each example works with minimal or synthetic data.

  7. Build a personal gallery. The chapter's 50 types are a starting point. Copy the entries you use most often, adapt to your data and brand, and maintain a personal collection for fast access.

  8. The gallery prevents wrong-chart-type mistakes. The "when NOT to use" entries for each chart type are as important as the "when to use" entries. Reading both helps you avoid the common mistakes in Case Study 2.

  9. The gallery connects to every earlier chapter. Each chart type was introduced in a specific chapter (bar in Ch 11, violin in Ch 17, choropleth in Ch 23, etc.). The gallery collects them in one place with a consistent format.

  10. This is the final chapter. The book has covered perception, design, code, tools, specialized domains, dashboards, reports, branding, workflow, capstone, and gallery. The skills are yours. Use them well, use them honestly, and keep building.

This is the last key-takeaways section in the book. The gallery is your permanent reference for chart types and code patterns. The workflow from Chapter 33 is your permanent process for producing charts. The brand system from Chapter 32 is your permanent styling infrastructure. Together they form a complete visualization practice. Keep practicing, keep critiquing, and keep shipping good charts.