The detailed animation that corresponds to the large still runs on a 4" monitor. Play this animation which is a java applet. A large amount of scientific visualisation is now created via digital simulation, from bio-computing to astro-physics. Yet simulation bring with it abstraction. The model of stem cell development, for example, uses mathematical rules of behaviour as we understand them, but it excludes many elements within the complex system that actually operates and which affects the behaviour of cells.