Online index of mechanical puzzles

John Rausch’s Puzzle World website showcases some incredible and ingenious objects from Rausch’s own puzzle collection, and from those of others. The site is divided into categories like interlocking solid puzzles, impossible object puzzles, sequential movement puzzles, etc. It’s a nearly inescapable click-trap. Shown here are two of my favorites, so far. Above is Stewart Coffin’s handmade “Jupiter” puzzle, and below is Harry Eng’s “Jar of Tennis Balls.”