English: Rectangles in aspect ratios ρ, ρ2, ρ3 (top) and ρ2, ρ, ρ3 (bottom row) tile the square, with ρ the real root of cubic equation ρ3 = ρ + 1.
If the area of the square is 1, the rectangles have areas 1/ρ5 (blue and green), 1/ρ6 (red), 1/ρ7 (purple), 1/ρ8 (brown) and 1/ρ9 (yellow).
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Zilverspreeuw
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