Johannes Kepler
Ilustration from "Harmonices Mundi" / The Harmony of the World (1619, Keplers experiments with five-fold symmetry. Kepler aligned n-gons together to form a cycle. He tried to fill the inner region by other regular n-gons, as we may see in figure Y (octagons and squares). In the same manner he also joined ten pentagons; the inner region forms a regular decagon (Figure Z). Keplers major result is shown in Figure Aa)

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