Solving puzzles such as TipOver and River Crossing can be surprisingly difficult.

A skein of intriguing mathematical objects comes out of an evening devoted to knitting, crocheting, and other crafts.

A polyhedron with seven faces, 14 vertexes, 21 edges, and a hole makes an intriguing lamp.

A New Orleans sculptor and his tetrahedron-based artworks survived Hurricane Katrina.

Switches in train track layouts lead to a tangled math problem.

Hiding a coin in a cake offers a lucky slice and a tantalizing math problem.

Numbers, lines, squares, and shadows add up to an intriguing set of artworks rooted in mathematical concepts.

Math-inspired and science-related artworks enliven an imaginatively landscaped sliver of parkland.