In the last few days I've been really pushing to familiarize myself more with Processing. I eventually want to get to control of physical things, but that will likely go through Processing, and it is also really fun and interesting to control digital things that you program yourself.
The videos below show a few of the things I've made. So far I have been mostly using finger positions to control the animations so I switched it up in the standing wave program and used hand characteristics, specifically the size of the 'sphere' made by your palm and fingers. I tried to control both the amplitude and frequency of the standing wave but that lead to some inconsistent results because the program would essentially redraw the entire curve if there was any small movement and it's hard to hold your hand completely still. So I just left it with one parameter to control.