Prime Wheel
The wheel above has 72 spokes positioned at angles in degrees equal to the 72 prime numbers
from 0 to 360 clockwise from the center-top line. Note that the spokes tend to be close together
for the smaller angles which is a well known characteristic of prime numbers (the "thinning" of the primes").
A arbitrary gradual color gradient from blue (for the smaller primes) to red (for the larger primes)
in analogy with the color of optical wavelengths (shorter wavelengths are blue ... longer wavelengths are red).
Click the wheel to see the actual values of the prime-number angles.