You can make any pinwheel-type shape with four wheels and can vary the line from center to edge in any path. This includes a bunch of spirally-looking things.

You can make any pinwheel-type shape with four wheels and can vary the line from center to edge in any path. This includes a bunch of spirally-looking things. (Also you can just cut it in half similarly instead of in four.) Picture: http://cl.ly/3K1i2K3O0p2f1U291636/Screen_shot_2011-05-25_at_9.35.01_AM.png http://cl.ly/3K1i2K3O0p2f1U291636/Screen_shot_2011-05-25_at_...