You have to be patient, but you will probably get a pretty fern. To change the way it looks, click on the black sliders to change the knob values. If you want to download the source, there are a couple other variables you can change if you feel like adding more knobs. This is a Barnsley fractal that was inspired by the source here http://www.geocities.com/bmw328driver/JavaFern.htm There are some cool things to check out in the source, like how I made the sliders.