Assume a bounding box of a square. What are some simple shapes that fill up a good portion of the interior?
Circle
Square
Triangle with base spanning with one side of the bounding square and tip on midpoint of opposite edge.
Letter D with flat edge spanning an edge, round arc on opposite edge
Isosceles right triangle with right angle at square corner. Maybe convex rounded hypotenuse.
Playing with a square with different corners rounded: diagonally opposite corners, and round 3 out of 4.
Inspired by graphics replacing certain letters in (often) logo designs. O is a popular letter to replace. We do need an interior for there to be something to replace.
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