This cool invention from Russian door manufacturer Mauer Buro allows you to change glass from opaque to translucent with the flick of a switch. The technology behind it consists of a liquid crystal polymer membrane (activated by remote control) and two outer layers of conventional glazing. As the result we get a surface that can be used as a window, partition or room divider. It lets in light when you need it and becomes an opaque shield when you want some privacy. Clever stuff!