Well it's not Star Trek's transparent aluminum, but 5 cm thick translucent concrete impresses me.
Luccon is a material developed in the early 2000s by architect and designer Juergen Frei. It’s basically made up of lasagna-like layers of concrete and fiber optics through which light can pass. However, the material is sealed and just as strong as concrete.
Available in thicknesses from 10mm to 500mm, Luccon can also vary in pattern from straight lines to wavy, depending on the dramatic effect needed.
A great idea! I can think of all kinds of uses, if it is as strong as they claim.