Rubik's Cube is a mechanical puzzle invented in 1974 by the Hungarian sculptor and professor of architecture Ernő Rubik. The plastic cube comes in four widely available versions: the 2×2×2 ("Pocket Cube"), the 3×3×3 standard cube, the 4×4×4 ("Rubik's Revenge"), and the 5×5×5 ("Professor's Cube"). 6×6×6 and 7×7×7 cubes are also currently being produced. The 3×3×3 version, is the version usually meant by the term "Rubik's Cube". Originally called the Magic Cube by its inventor, it was renamed Rubik's Cube in 1980 and released worldwide in May of that year, winning a Spiel des Jahres special award for Best Puzzle. It is said to be the world's best-selling toy, with some 300,000,000 Rubik's Cubes and imitations sold worldwide.
Workings
A standard Cube measures approximately 21⁄4 inches (5.7 cm) on each side. The puzzle consists of the twenty-six unique miniature cubes ("cubies") on the surface. The Cube can be taken apart without much difficulty, typically by turning one side through a 45° angle and prying an "edge cubie" away from a "centre cubie" until it dislodges (however, prying loose a corner cubie is a good way to break off a centre cubie - thus ruining the cube). It is a simple process to solve a Cube by taking it apart and reassembling it in a solved state; however, this is not the challenge.For most recent Cubes, the colors of the stickers are red opposite orange, yellow opposite white, and green opposite blue. However, there also exist Cubes with alternative color arrangements. These alternative Cubes have the yellow face opposite the green, and the blue face opposite the white (with red and orange opposite faces remaining unchanged).
Permutations
A Normal (3x3x3) Rubik's Cube can have 43,252,003,274,489,856,000 different positions, also referred to by the mathematical term permutations. Despite the vast number of positions, all Cubes can be solved in twenty-seven or fewer moves.
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macam aku inda paham photography... tau gambar saja.....