Science Narratives

L-System Weeping Willow

A weeping willow encoded as grammatical rules — cascading branches, drooping foliage, and dense canopy grown from a rewrite system.

The weeping willow is a study in parameter-driven form. Its cascading branches, drooping leaves, and dense canopy are not decorative accidents but responses to environmental pressures: wind, light competition, and water availability. This L-system encodes those pressures as grammatical rules, producing a tree that looks decisively like a willow while remaining entirely synthetic. The layered output separates trunk, drooping branch architecture, and fine foliage. Each layer is a different recursion depth and branching angle, drawn in a single pen pass. The result is a tree that appears to weep not from emotion but from geometry—a direct consequence of the angle and length parameters encoded in the L-system.

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