# L-system Graphics × Reaction–Diffusion — composed image prompt
# IndexStyle — https://indexstyle.org/compose?ids=l-system-graphics+reaction-diffusion
# L-system Graphics carries the structure and Reaction–Diffusion appears as the accent.
# Style descriptors only. This prompt names no artist, studio, brand or work.

Produce four original images that take their structure from L-system Graphics (technique, 1968–) and their accent from Reaction–Diffusion (technique, 1952–).

## What to make

Make the kind of thing L-system Graphics exists for: modeling plant growth in education, visualization and generative motion, or making reproducible branching patterns and ornament from a small rule set. Choose one subject and hold it across all four.

## Structure comes from L-system Graphics

- Branches repeating one angle rule from a trunk
- Self-similar detail increasing by generation
- Leaves or flowers attached regularly at tips and joints
- A growth grammar that survives controlled randomness

Composition: Anchor one root and plan how each generation expands into the available field. Type and lettering: Set rules and generation numbers in monospace outside the generated form.

## Accent comes from Reaction–Diffusion, used sparingly

- Round spots dividing at even distances
- Continuous curving maze stripes
- Coral or cellular boundaries branching from edges
- Self-organized marks of nearly constant thickness

Let one material quality come from it: Set reaction terms, diffusion rates, feed and kill rates, then iterate from a small perturbation.

## Colour and feeling

Build the ground on #F2F0E5, carry the structure in #5A8F62 and #183126, and let a single accent come from #38C6A3. These are read off real works, so a direction rather than a fixed palette.
Feeling to carry: technique, calm, futurity, exhilaration.

## Where they fight

- L-system Graphics and Reaction–Diffusion both belong to Computational Expression, so the difference is small. Push the roles further apart than feels comfortable.
- L-system Graphics and Reaction–Diffusion are techniques rather than looks. Decide which one runs last in the process, because that is the one that will show.

## What goes wrong

- L-system Graphics: Mirroring branch photography is not an L-system. Preserve the production rules that generate each generation.
- Reaction–Diffusion: A hand-drawn animal print is not reaction-diffusion. Time and parameter changes must remain visible in the pattern.

## Across the four

Keep the roles fixed in all four. Vary the framing, the scale and the arrangement so the set shows what this pairing can do rather than four versions of one picture.

## Constraints

- Do not imitate, reference or name any specific artist, studio, brand, character or copyrighted work.
- Do not reproduce the composition of an existing work.
- Produce original compositions in the general period languages described above.

Design specs for each entry: https://indexstyle.org/styles/l-system-graphics/design.md · https://indexstyle.org/styles/reaction-diffusion/design.md