Now that we had done some computations on the particle system and had gotten our multitouch to work, we were faced by a real problem: We needed to specifically define what we wanted to do and even more specifically how we wanted to affect the particle system based on our input.
We came to the conclusion that we wanted to simulate physics behavior in space. This means we wanted to make the hands touching the screen into big planets with high mass and at the same time give the particles a very low mass, causing them to orbit our "planets". Multiple hands would create more and more interesting behavior from the particles. This meant that we had to create a function based on time that described the orbits around the hands.
At this point we were very tired of discussing what to do with the particle system, so we decided to start implementing things during the next work session.