Escher's Birds and Fish Tessellation, Optimized

Print the models starting with “black” in one colour and the models starting with “white” in another to get the effect of the original Escher tessellation. Model geometry was reduced to 0.5% of the vertex count of the original. Model geometry was cleaned up a bit. The wings of the birds were bent down and thinned partly for aesthetic reasons, partly for the reduced printing time and material use. Model files were renamed to include “black” and “white” instead of “left” and “right” to simplify printing.