I had been doing some work that required knowing how many permutations there
were of a set containing N elements.

That can be done with Heap's algorithm.
(I used the non-recursive version, because the recursive one was way too
confusing, and I couldn't get it to work)

I decided to see what that would look like using colors.

<0, 0, 0>, x, y, z, x+y, x+z, y+z, <1, 1, 1> has 40320 permutations.
And with sphere radii of 0.75, they just barely fit into a 1920 x 1080 render.

- BW

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