I've worked on a number of projects using PMMA-coated acrylic, which diffracts light in a unique way. Due to Bragg diffraction, the acrylic appears to be a different color depending on the angle at which it is held.
POLYHEDRA
In 2010 I modeled and built polyhedra using regular shapes cut from acrylic to experiment with the way light interacts with PMMA faces set at different angles and the aesthetic differences between open and closed solids.
CHANDELIER
In 2012 I built a chandelier and hung it under a skylight where air currents and diffuse lighting produced a kaleidoscope of shifting colors and reflective patterns.
