Hexagonal ECA

[chebee7i]

In order to implement hexagonal ECAs properly, we need:

• non-symmetric radius via Non-symmetric Radius #1
• time-varying radius via Alternating Radius #2

For example, a hexagonal ECA with radius 1/2 uses two types of radii, a (0,1) and a (1,0):

Even Rows:    a b                Odd Rows:    a b
                x                             x

Note that the mean radius (averaged over time) in each direction is 1/2. Also, #2 is probably overly general. We can have hexagonal ECAs just with alternating radii.