This is a sketch for Rule 30 written in Processing. Here is a download link for Processing: https://processing.org/download/?processing

To start the sketch, open file in Processing and press the 'play' icon. The screen will appear blank. To start the program, click the mouse button. At any time the sketch can be paused by clicking the mouse. To resume the sketch, simply press the mouse button again.

To restart the sketch with just the blank canvas, press the 'r' key. Then to start the sketch again, click the mouse button.