| 摘要 |
A novelty or educational device having, in combination, a first panel having a group of illustration segments in a predetermined pattern, with at least one overlay panel contiguous to the first panel and separated from that panel by a fold line. The overlay panel has a plurality of window areas arranged in a pattern corresponding to the predetermined pattern of the first panel. A second group of illustration segments on the non-window areas, would be the complement of the first group of illustration segments and would correspond to the second overlay panel. The window areas are formed in a complex pattern alternating from window to solid area in both the horizontal and vertical directions thereby obfuscating the illustrations. Both the reverse and the obverse of each panel contains illustrations segments which are the complement of illustration segments of other panels, thereby providing a number of illustrations.
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