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Figure 125 shows a very simple amusement consisting of three identical rhombic blocks with pins and holes. Note that the only way it can be assembled is to start all three pins into the holes simultaneously and bring all three blocks together. This model is a simple example of a coordinate-motion puzzle. Such puzzles cannot be assembled sequentially, but rather at some stage of assembly they require the simultaneous manipulation of three or more pieces or groups of pieces. Unlike this simple example, such puzzles can be very baffling. One such puzzle has already been included surreptitiously in a previous chapter without being identified as such!
Fig. 125
The Expanding Box Puzzle
The Rosebud Puzzle
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