The Soma cube is a puzzle that involves fitting seven different poly-cubes together to form a 3x3x3 cube. The puzzle was invented by Danish polymath Piet Hein in 1933. The Soma cube can help develop spatial reasoning, architectural skills, and hand-eye coordination. It can also introduce concepts of symmetry, geometry, and combinatorics. The pieces of the Soma cube consist of all possible combinations of at most four-unit cubes, joined at their faces, such that at least one inside corner is formed. There are no combinations of one or two cubes that satisfy this condition, but one combination of three cubes and six combinations of four cubes that do. Thus, 3 + (6 × 4) is 27, which is exactly the number of cells in a 3×3×3 cube.
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