Profuse thanks to Adriana, for the link, to this report:

A Hungarian architect has combined the world’s most popular building material with optical fiber to create LiTraCon a new type of concrete that transmits light. The results are stunning.

Indeed.

Where does she find these things?

Well, I can tell you where that picture at the top with the trees came from. It came from this guy. Go there. Worth a scroll. I like this. More games with light. A bit too seventiesish to live with though.