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  2. Missing square puzzle - Wikipedia

    en.wikipedia.org/wiki/Missing_square_puzzle

    The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures; or rather to teach them not to reason using figures, but to use only textual descriptions and the axioms of geometry. It depicts two arrangements made of similar shapes in slightly different configurations.

  3. Soma cube - Wikipedia

    en.wikipedia.org/wiki/Soma_cube

    Soma cube. The Soma cube is a solid dissection puzzle invented by Danish polymath Piet Hein in 1933 [1] during a lecture on quantum mechanics conducted by Werner Heisenberg. [2] Seven different pieces made out of unit cubes must be assembled into a 3×3×3 cube. The pieces can also be used to make a variety of other 3D shapes.

  4. Mechanical puzzle - Wikipedia

    en.wikipedia.org/wiki/Mechanical_puzzle

    The game consists of a square divided into 14 parts, and the aim was to create different shapes from these pieces. This is not easy to do. (see Ostomachion loculus Archimedius) In Iran "puzzle-locks" were made as early as the 17th century AD. The next known occurrence of puzzles is in Japan. In 1742 there is a mention of a game called "Sei ...

  5. Ogawa Falls - Wikipedia

    en.wikipedia.org/wiki/Ogawa_Falls

    Ogawa Falls (Japanese: 雄川の滝) is located in Minamiōsumi, Kagoshima, Japan, the town in the southern tip of the Osumi Peninsula. It is a 46-meter (151-foot) waterfall , 60 meters (197 feet) in extended width, in the midstream of the Ogawa River.

  6. Combination puzzle - Wikipedia

    en.wikipedia.org/wiki/Combination_puzzle

    A combination puzzle, also known as a sequential move puzzle, is a puzzle which consists of a set of pieces which can be manipulated into different combinations by a group of operations. Many such puzzles are mechanical puzzles of polyhedral shape, consisting of multiple layers of pieces along each axis which can rotate independently of each ...

  7. Jigsaw puzzle - Wikipedia

    en.wikipedia.org/wiki/Jigsaw_puzzle

    Puzzles. A jigsaw puzzle (with context, sometimes just jigsaw or just puzzle) is a tiling puzzle that requires the assembly of often irregularly shaped interlocking and mosaicked pieces, each of which typically has a portion of a picture. When assembled, the puzzle pieces produce a complete picture. In the 18th century, jigsaw puzzles were ...

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