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It looks like a nice exercise, but for a real patent you sadly need a real layer. There are a lot of standard patenting tricks to ensure nobody can make a stupid generalization of your patent and get a patent that includes your idea. Does you patent apply to cubes with N layers? Does your patent apply with cubes painted with less (or more?) colors?

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I worked very hard to get it accepted as is. But it's obvious that if a professional had written this patent, it would have been more general and robust. But it's expensive, especially to make it world-wide, and that's not at all what I want. This patent was a non-technical aside in this project.

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