particleIllusion (pIllusion for short) is a stand-alonecomputer graphics application based on the particle system technique which allows users to create graphical animations, e.g. fire, explosions, smoke, fireworks, and various abstract visual effects. The predecessor of pIllusion is Illusion 2 (1999~2001) which is licensed to Impulse Inc. The chief programmer, Alan Lorence was in disagreement with Impulse Inc and formed another company namely Wondertouch. The upgraded version of Illusion has been rebranded and released as particleIllusion 3.0, which features new functions such as super emitter and force field.