Double Spearhead Tessellation Variants

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This is a model folded back in 2018 which I somehow forgot to post earlier. Each molecule of my Double Spearhead Tessellation can be modified by sinking any number of the flaps located in its four sides. The work presented here contains mostly molecules in which two opposite sides were modified in this way since this variant results in a symmetric pattern when multiple molecules are placed side-by-side, but you can spot some other variants in the mix as well. One obvious possibility, which I didn’t use in this piece, is sinking all four sides. In back-light, all variants look almost the same since only the ordering of layers changes: the only visible differences come from the little reflected light which is always there.