Penrose tiling with thick (36°/144°) and thin (72°/108°) rhombuses. Built by deflation: each tile splits into smaller tiles preserving the golden ratio τ = (1+√5)/2. The pattern is aperiodic — it never repeats — yet has global 5-fold symmetry.
Drag to pan. The ratio of thick to thin rhombuses → τ² ≈ 2.618 as deflations increase.