This is another sketch for my processing course at NYU's ITP.
In this sketch the rain speed responds to the mouseX location. But you have to press 'r' to trigger the rain.
if you click 'p' you can fly a plane around the screen.
if you click the mouse, clouds will appear for a moment.
Any other key will 'clear the sky.' But, of course, it will stay nice and "Seattle" gray.
To tweak this sketch, first download it.
Make your updates, then upload your tweak!