English: The production rule is (a ↦ aba) (b ↦ c) (c ↦ ada) (d ↦ a) with initiator d, iterated for 17 generations. l(wn) = A001333 = A089928(n−4) + ... + A089928(n−1). The incidence matrix has reducible characteristic polynomial f(x) = x4 − 2x3 − 2x − 1 and dominant eigenvalue λ = silver ratio σ ≈ 2.41421. The rectangle and its four coloured subzones have areas in the ratios σ3 + σ2 : σ3 : σ2 : σ : 1. The viewport width is 0.75.
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