The box holds five pyramids of each size for four colours. The number of pyramids in each stack is important because otherwise the fit won't be exact and the pyramids will be loose inside. The triangular pegs hold the lid in place, and once closed the pyramids are held in place by the engravings in the base and the holes in the middle layer.
The tolerances on the fit are pretty tight; this design works with Looney Labs pyramids, but if you're using pyramids of a different brand, I wouldn't trust the fit without doing some testing first.
If you would like a version that holds more or fewer colours, or with additional spacing between stacks, or that works with a different thickness of wood, please let me know and I can easily generate an updated design.
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