Imagine that by moving the mouse you planted seeds. Does a seed store a blueprint of the tree? Or, it knows only how to generate a stalk from which the tree will evolve (by itself).

For detailed instructions on using the program, take a look at the info window

Download the StarLogoT source code for the model:
Download this model

To run this file you need StarLogoT2002 for the Macintosh.
(download StarLogoT)