| 摘要 |
This object is constituted by three plates 1a, 1b and 1c made of transparent rigid plastic, fitted into one another thus physically embodying a base 15 in the third dimension. This base 15 accommodates various accessories which are attached via a sucker system 7 equipped with a central orifice 9a trapping a ball 4 onto which the various accessories are fixed by means of a short stem 3b (ball and socket system). These accessories are: plane portions 2b and stems 3a representing straight lines and/or vectors when they are equipped with arrows 6a and tails 6b. A specially designed set square makes it possible to place the accessories at a given angle. <IMAGE>
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