Rhythm (from Greek rhythmos): "any regular recurring motion, symmetry" a "movement marked by the regulated succession of strong and weak elements, or of opposite or different conditions".
It's magic : on a black PMMA sheet, a white / sliver print appears when lasering.
How? Oroglas® Magic contains special additive which can be made "visible" by using special type of laser dedicated for marking. Type is for example YAG laser