Demand. It's ubiquitous. I've seen it in every prototype or mockup or early version of every larger-than-a-breadbox system I've worked on. It's used for lightin

Demand. It's ubiquitous. I've seen it in every prototype or mockup or early version of every larger-than-a-breadbox system I've worked on. It's used for lighting, sound systems, camera mounts, even shelving in some cases. Whenever two or more engineers get together to design something, 80/20 is there in spirit at least.