As part of Touch Interactive i created a touch based interactive installation using processing. It was made with msafluid lib and toxiclibs 

Gravity and force apply momentum to the ‘comet’ to move it through space. The ‘comet’ is constantly exploding leaving behind it a trail of light which gradually fades as time elapses. Occasionally the ‘comet’ explodes brightly and small bands of colour emerge from the sparks and trails. The user is able to interact with the ‘comet’ by altering gravity and force to push and change the momentum and speed of the ‘comet’, creating new explosions and trails which warp and twist as the ‘comet’ moves through space. 

My daughter having a play with it - February 2011