Jigsaw puzzle with three=dimensional surface - has different views on two major faces using blocks which fit major faces of reversible board

摘要

The jig-saw puzzle uses laterally interlocking blocks (1) to build a three-dimensional model, e.g. a contoured landscape, and the two opposite major faces (2,3) of the assembly present two different views or landscapes. The correct vertical relationship between blocks, i.e. in planes normal to the finished major surfaces, is established by an appropriately contoured board (4). The top surface (5) of the board reciprocates that of the under surface (3) of the primary assembled model. In plan views, the blocks may have interlocking edge profiles of alternative geometric forms, and may be triangular, square or rectangular etc.