Make fractals without a computer

[Tim Hutton]

It's a bit like the video feedback idea that was used on Doctor Who. But cooler!

1) Point two or more projectors at a wall.
2) Hook up a video camera to them.
3) Point the video camera at the wall too.
4) Wiggle everything around. Fractals!
http://www.youtube.com/watch?v=Jj9pbs-jjis

Can we do this sometime at Derby Makers? I notice that we have two projectors. Does anyone have a VGA splitter?
https://www.google.co.uk/search?q=vga+splitter&hl=en&safe=active&source=lnms&tbm=isch&sa=X&ei=7BY6UaqoIIfC7AbZ6YGoAg&ved=0CAcQ_AUoAQ&biw=1863&bih=1202
We can use my laptop's webcam as a video camera.

Wikipedia tells us why it works:
http://en.wikipedia.org/wiki/Iterated_function_system
http://en.wikipedia.org/wiki/File:Ifs-construction.png

The whole image is made of several smaller copies of itself. And that's exactly what a fractal is.

Fun!

Tim