In a word: iconic. In 1974, Hungarian architecture professor Erno Rubik created his "Magic Cube," an astonishing blend of art, physics and math. The Rubik's Cube soon became the world's best—selling toy and launched the "twisty puzzle' trend. Rubik puzzles—in all their shapes and sizes—continue to perplex, engross and sometimes infuriate kids and adults all over the world. We love them for their unputdownability.