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Central model of the cube inversion.
(J.P.Petit 1991, imaging by C.TARDY)
Here we show how to build this model by making four elements using yellow and green cardboard. A cutting, invented in 91 at the same time as the model, will be provided soon.
For information, the other steps of this cube inversion remain to be invented. We will indicate another one very soon (I need to pass the model in cardboard to Christophe so that he can convert it into a new object of the virtual reality menagerie)