| 摘要 |
A geometric construction system includes at least two panels which are sidewisely and pivotally coupled together. Each of the panels has a plurality of side edges, a central opening confined by the side edges, a supporting plate received in the central opening, and a plurality of retaining plates laterally protruding from inner walls of the side edges into the central opening and cooperating with the supporting plate so as to form a plurality of retaining slots. Flexible patterned sheets are received in the central openings in the two panels. Each sheet has engaging portions respectively extending into and engaging releasably the retaining slots so as to be detachably retained in the central opening in the respective one of the panels.
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