NASA perfected Di-Chroic coating for use in space shuttles. The product was developed by NASA in the 1960’s for use in satellite mirrors.The layering of the di-chroic finish must be done in a vacuum chamber where an electron beam deposits many microscopic layers of metallic oxides, such as magnesium and titanium, on the optically pure glass. The metallic coating absorbs different colors of light at different angles making the glass multi-hued. The cubes-on-base are coated on the three concave undersides; this allows the color to “bounce” around inside.