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The first activity is to cut out some pages of the book and make eight curious open cubes with card mirror surfaces on a diagonal. When a set of four of these cubes is placed in an open box, the reflections you see are indeed puzzling and also unexpected. There are two sets of puzzle pictures to find by rearranging the cubes and this demands logical thinking of the most enjoyable kind. Young children will enjoy the "Junior" puzzles and the "Senior" may well test the thinking power of many adults.