Kaleidoscope applet.

Kaleidoscope:


More kaleidoscopes:


And my favourite, tiny little kaleidoscopes:


Originally made by David E. Joyce in 1983 in Pascal. Here's the source.

Mr Joyce has also explained the mutations of phylogenetic trees in a beautiful way. Those blocks.

Here's some mutations I made:







That last one there is made from this configuration:

I could press the new phyl button all day. It's the most aesthetically satisfying activity thing I've done in a while.