Versato Myst collection, manufactured by PyraSied in cast polymethyl methacrylate (PMMA), acrylic, with fluorescent and diffusing pigments. The cut edges appear more saturated than the faces, due to a phenomenon known as edge glow, or lit edge. It is caused by lightwaves being refracted internally and transmitted out through the edge, rather than the surface. The effect is enhanced by fluorescent pigment.