Representation of the seven basic structures in crystallography. The original print was made for illustration purposes in our XRD (X-ray Diffraction) laboratory. The crystal elements were printed in "glow-in-the-dark" PLA, the name plates were printed first in black PLA then with white PLA as topping for the text. The whole system of crystal blocks and name plates was engraved into an oak plate. OK there has been made a mistake!!!! The trigonal crystal was designed incorrectly. I have added the correct Trigonal crystal in a separate file. I have not yet updated the rest of the files!!!!!