A mixture of traditional concrete and fiber-optics, TranslucentConcrete (not to be confused with translucent concrete—yes, I know) can be used by architects to make load-bearing walls a little more see-through than they normally are. Check the amazing effects in the gallery below.
The concrete can be cast in just about any way possible: bricks; fa ade plates or paving stones, and you can even incorporate logos in them. The fiber-optics come in different diameters as well—from 2 micro- to 2 mm.
Even colors can be detected through the walls, which can be as thick as you like, as it is only at 20 meters you start to see a loss in light. Expect to see this at the top of many architects' shopping lists in the next decade. [Dezeen]