and a hollow hand-blown glass sphere. The Glass Holosphere is a multimedia sculptural piece. The sculpture is composed of a hollow hand-blown glass sphere inside of a pyramid based holographic system ...

A lamp used to be simple thing: just stick a filament in a glass bulb ... decided to build the thing themselves. Coating the inside of the foam sphere took several attempts.

As [Les Wright] explains, an integrating sphere is an optical element with a hollow spherical cavity that’s coated with a diffusely reflective coating. There are two ports in the sphere ...