| 摘要 |
In a three-dimensional jigsaw puzzle which is made up of a plurality of pieces fitting together along mating surfaces facing each other and which, when assembled, forms a continuous piece of a predetermined shape, at least one linking surface between the pieces is a part of a surface which is produced when a line (P1, P2, P3) which is contained in a certain plane in a three-dimensional space and which is a tortuous line, or the like, rotates about a straight line (T1, T2, T3) contained in the same plane, in such a manner that the distance of each of the points in the line from the axis is maintained. The shape of the line being selected to be, for example, folded, in such a manner that the pieces will not be detached from each other in any other direction than by being moved in the said rotational direction.
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