Many butterflies, and insects more generally, feature nanostructures whose functional purpose and whose biogenesis are intriguing. Especially the latter -the formation mechanism of these nanostructures- is often hard to decipher due to the difficulties that biological samples often pose for in-vivo and post-mortem microscopy studies, including low contrasts, difficult accessibility, living tissue, etc. A particularly beautiful example of such a nanostructure is the chitin Single Gyroid structure which is a highly-symmetric and regular network-like porous structure, with lengthscale of around 300nm, which the butterfly employs as a photonic crystal material to generate its green coloration.