Chalk Logic

Turn one idea into one quiet white-chalk proposition on an even green board. Render by default when image generation and inspection are available; otherwise return the compiled prompt and recipe.

Visual contract

Treat every bullet as both a generation rule and a QA gate:

• One proposition: communicate one process, relationship, structure, cycle, accumulation, attenuation, or observational premise. Give it one unmistakable reading path.
• Quiet field: keep roughly 65%-75% of the board empty. Raise this to 76%-86% for a single sparse sequence or observational vignette. Preserve generous outer margins and a compact concept-bearing motif.
• Even board: fill the canvas edge to edge with a flat, dry, desaturated schoolroom-green board. Use microscopic matte grain that stays quiet at thumbnail size. The frame contains only the board and the concept-bearing chalk motif.
• Mineral hand: draw only with warm-white mineral chalk. Use three restrained contrast levels: faint construction or context, readable structure, and very few brighter contacts. Show pressure variation, slightly broken stroke edges, occasional double strokes, and tiny deposits.
• Coherent strokes: draw semantic paths as continuous gestures, with material breakup limited to stroke edges and endpoints. Use intersections only when they carry a clear causal or structural meaning.
• Exact but handmade: make the composition deliberate and the marks human. Build recognizable forms from observed silhouettes and functional anatomy; build abstract forms from specific spatial behavior.
• Wordless default: render zero text, letters, numerals, equations, pseudo-writing, signatures, logos, or watermarks. If the user explicitly requires text, use only their exact wording as one short phrase or up to three micro-labels with six words total.
• Original topology: satisfy the anchor delta declared in Step 3 and build the composition from the concept's own mechanism.
• Two-scale clarity: make the proposition legible at thumbnail size and reward full-size inspection with quiet material detail.
• Authored restraint: keep every mark in the proposition. Use the fewest structural forms that preserve the intended reading.