The original SpectraBloom was built in 2004. It is an application of ultrabright LEDs, which have since become quite common.
I used a concept my father, Arthur Conrad, developed in the 1960's which he called a "Spectramobile". Arthur used three incandescent spot lamps with color filters - amber, green, and blue, aimed upward so the light converged on the ceiling as a white area. When a mobile was hung from the ceiling, wonderful colored patterns would appear. Heat from the lamps would rise and move the mobile so the colored shadow patterns would change.
I produced a few SpectraBlooms like the one shown here, but they are no longer available.
A few years ago the concept was picked up by Will Schorre. After many revisions and much refinement, he has produced an elegant design with added features of color-fading.