English: The production rule is (a ↦ b) (b ↦ ac) (c ↦ a) with initiator c, iterated for 60 generations. The incidence matrix M [0,1,1; 1,0,0; 0,1,0] has characteristic polynomial f(x) = x3 − x − 1 and dominant eigenvalue ρ = 1.32472 (the plastic ratio).
The combined surface and the three separate tiles have areas in the ratios ρ5 : ρ2 : ρ : 1. The viewport height is 3.2 and the origin is at the eye of the swirl.
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