At first glance, this may look like something straight out of the TV show “Black Mirror” however, it’s a very uncommon pre-fabricated concrete block/panel implemented by Aron Losonczi, a Hungarian Architect, starting back in 2001.
Although the concept can be traced back as far as 1935, conceptualized, tested, and patented by Long Bernard, and Saint Gobain, It was re-designed using Fiber Optic materials instead of glass later on.
(original patent and description can be found here:
https://worldwide.espacenet.com/patent/search/family/035341810/publication/CA353849A?q=pn%3DCA353849