English: The production rule is (a ↦ abca) (b ↦ ba) (c ↦ abc) with initiator b, iterated for 13 generations. The incidence matrix M [2,1,1; 1,1,1; 1,0,1] has characteristic polynomial f(x) = x3 − 4x2 + 3x − 1 and dominant eigenvalue λ = ψ3 ≈ 3.14790 (the supergolden ratio-cubed). See OEIS: First trisection of Narayana's cows sequence.
The central tile and its three subtiles have areas in the ratios ψ4 : ψ2 : ψ : 1. The viewport height is 2.6 and the origin is at the cross.
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