A fractal pattern generated by a progressive replacement system - each rule has the same relationship to its neighbors. In math, numbers are constructed with just such a system; start with zero and each number is the number before it plus one. It is how we count.
[Broken links: See Progressive 2
for a description and Progressive 2x2 rule systems
for descriptions of, and links to, related patterns.] The pattern is a 2-D generalization of Sloane's integer sequence A000120
.A 2K x 2K version
Here's a color version
Also see ~vidthekid
's related pattern "Silver Squares
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