Above is the web version of the Proportional Figure created by Thomas Rasche.

Simply swipe (or click+drag) to spin the image... Align one marker with a dimension, and you can then instantly see the other markers next to the golden proportion numbers. You can also purchase a real world Proportional Figure in the shape of a CD (includes explanations German and English). Here is an image:

Proportional Figure

UK signed £10.00 GBP Europe £13.50 GBP World £15.00 GBP