L-system

L-systems are a way of writing out a set of rules that tell a computer how to draw shapes. Think of it like a set of instructions that the computer follows to make a picture. To make a picture with an L-system you need to come up with a set of rules. For example, you might start by writing a rule that says 'draw a line forward, then turn left'. Then you might add a rule that says 'if you see a line, draw two lines at right angles'. This way you can create a pattern that looks like a tree or a flower - all using just a few instructions.