Create a KIRUPA teaching illustration. Read /design/sections/illustrations.md and inspect its actual BFS and Merkle Tree images before drawing. Use /design/illustrations.json for source images, sampled colors, the author-confirmed Permanent Marker font, and licensed resources. State the figure's teaching point. Show recognizable objects with consistent Twemoji or simple colorful flat artwork, quiet structural lines, restrained rounded containers, and generous spacing. Keep the same objects, coordinates, scale, and crop across states. Use pale role-based fills and stronger readable labels/arrows; never let color alone carry meaning. Use Permanent Marker only for short callouts, clean sans-serif for ordinary labels, and readable monospace for data. Do not replace physical objects with word-only boxes. Keep arrows, values, and directions consistent with the prose and code. Use a light artboard for fixed raster art; do not auto-invert or theme-tint its pixels. Preserve editable source, bundle or outline fonts correctly for SVG delivery, retain licenses, and supply purposeful alt text plus an introductory sentence. Check the final export at article and phone sizes, in Light and Dark, for clipping, missing fonts, readable contrast, and factual agreement. The listed artboard dimensions are recommendations, not site-wide CSS tokens.

Follow WCAG 2.2 AA for new or changed content: semantic HTML, keyboard access, visible focus, readable contrast in every theme, text alternatives, labeled controls, and explicit errors. Support zoom/reflow, respect reduced motion, and keep sound optional. Read /design/sections/accessibility.md for acceptance checks. Report unresolved barriers; automated checks alone do not establish conformance.