A Button Puzzle.
A Slit Puzzle.
A Slit Puzzle.—Cut a round piece of wood as in A, and four others, like B. Get them all into the cross-shaped slit, as in C.
Creeping Through a Small Space.
Creeping Through a Small Space.—Take a piece of cardboard or of leather, the shape and size suggested in the diagram. Cut it in such a way that you may creep through it, still keeping it in one piece.
An Ingenious Square.—Here is a way to place one to nine in three rows of three figures each, so that they will add up to fifteen in eight different ways.