Glass is a threshold material, serving as both a divider and an opening, for one can always see what is behind it. Florian Lechner (born in 1938) has dedicated himself to this unique material. He explores its substance and formal possibilities through architectural works and sculptural objects. For the first time, this publication provides a comprehensive documentation of Florian Lechners exciting work, through his significant works in an architectural context, free-standing glass sculptures and performances that combine glass, light, movement and sound in a state of flux.