| 摘要 |
A toy in the shape of a collapsible and expandable box is made of cardboard and has a stiff, square top and bottom and four side walls which can be folded to the outside along central folding lines by pressure onto the top. Each side wall is provided with an inwardly extending tongue, and each two tongues on opposite side walls are connected by elastic bands or springs which pull the walls back from their folded position into planar state, as soon as the pressure on the top is released. In this position the toy forms a cube, which may be decorated with pictures, maps, symbols or the like. |
