| 摘要 |
The invention concerns hollow and sealed volumes made of plastic, wood, metal, concrete, foam or consisting in an inflatable flexible envelope, capable of being filled with liquid, solid, expanded material or air, comprising a modular planar base on which is mounted a projecting volume, with rounded edges, capable of representing any shape and enabling by juxtaposition or nesting of their bases an infinite number of circuits for leisure and educational purposes.
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