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Five triangles in 3 different sizes, one square and one rhombus are the seven pieces, every Tangram is consisting of. If you prefer the more figurative Tangrams, like humans, animals, buildings, tools, ..., or the more abstract ones, that's your choice. One is fix, you must always use all seven pieces. It looks easy, but sometimes you will be happy, that there isn't a time limit. It also will happen, that you think, you have done it, but there is ...