THE LOWER PATTERN above looks at first sight as if it should extend happily in all directions indefinitely like the others. But it can't because it has a five-fold symmetry like a starfish. What happens if you try extending it beyond the bounds of the frame is what you see below.

However, if you cut that out and join the edges together what you get is half of a dodecahedron, one of the five Platonic solids. And if you join two of those together you get a colourful ball you can toss around.