Interesting Interaction

I found a site with a selection of playful, interactive code. These are some of the pieces I found interesting and inspiring. http://d3js.org/

http://bl.ocks.org/mbostock/1062544  

As you move the mouse over the piece, there is a constant stream of colourful circles which follow you. They gradually fade out, meaning you can try to make interesting and playful shapes.

http://mbostock.github.com/d3/talk/20111018/collision.html

The particles in this piece are repellent to the mouse, meaning the user can create holes and play with the direction of the mass colourful particles.

http://www.koalastothemax.com/

The site starts as just a solitary circle, however as you rollover the circle, it breaks into four seperate cirlces. This is continuously happens until it begins to produce an image of a koala.