| 摘要 |
A jigsaw puzzle 1 comprises a plurality of interlocking pieces 3. Each piece has a marking on an upper surface, and the pieces are collectively arranged to interlock in a first arrangement to provide a first predetermined image (fig. 3a) of a given overall shape, e.g. rectangular. The pieces are also arranged to interlock in a second arrangement to provide a second predetermined image (fig. 3b) of the same overall shape. Preferably, the puzzle includes two or more interchangeable regions 7, 9 of pieces which occupy different locations in the first and second images. Preferably no two pieces are of identical outline shape. The images may comprise an integer number N of repeating or similar elements, with the jigsaw being formed by making a first cut (E, fig. 2c) which intersects each of the N elements, and a second cut (C, fig. 2b) between two of the N elements to divide the elements into interchangeable regions bounded by outer cuts (A, B, E fig. 2b) and/or edges (D, fig. 2c), with the location of the second cut relative to the outer cuts being determined using a ratio which sums to N. |
