Star-shaped seed bed in a Maridol Papaya
When I first cut this open my first thought was, "Wow this is the second time I've found a recognizable shape in a papaya. How unusual!" But it is not unusual at all. Virtually all of the shapes we humans have discovered and named appear naturally in plants, snakeskins, honeycombs, insect eyes, flower centers, tree trunks, shells etc.
A wonderful photographic collection of shapes in nature can be found here