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Designing this stuff is a little like making a tangram .
It is interesting however to see how many convex figures you can make from the 7 tangram pieces.
Of indeterminate age - at least 150 but maybe much older, say, dating back to Pythagoras and his right triangles - the 7 tangram pieces (credited by some sources to the Chinese) can form countless different designs.
Some mornings I'll put the tangram sets on the table with a puzzle for each child to solve.
Tangrams consist of two small triangles, one medium triangle (the size of two small ones joined), a parallelogram and square (also equal to two small triangles), and two large triangles, equal to four small ones.
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