If people are not familiar with L-systems, wiki is a good place to start: http://en.wikipedia.org/wiki/L-system http://en.wikipedia.org/wiki/L-system Besides t

If people are not familiar with L-systems, wiki is a good place to start: http://en.wikipedia.org/wiki/L-system http://en.wikipedia.org/wiki/L-system Besides their inherent interest in modeling biological systems, people here might be interested in them as an example of a stochastic grammar, i.e., a system of rewriting rules where multiple branches can be taken with various probabilities. L-systems are not necessarily probabilistic, but in applications, probabilistic ones are often used.