The word “interactive” is found everywhere these days. It may be worthconsidering what “interactive” means and whether things presented to us as”interactive” actually are so, before moving on to consider why we might want our designed objects and spaces to be “interactive”. Interaction concerns transactions of information between two systems (for example between two people, between two machines, or between a person and a machine). The key however is that these transactions should be in some sense circular otherwise it is merely “reaction”
Usman Haque 2006 http://www.haque.co.uk
The second particles system reacts to the behaviour of the first one. Changing density and population. Producing a delayed coordination.
Next stop will be make the system interactive…Interaction and architecture.