It's expensive and coloured instead of totally transparent but it indeed exists outside of the lab. They did build a wall out of them in my former campus: http

It's expensive and coloured instead of totally transparent but it indeed exists outside of the lab. They did build a wall out of them in my former campus: https://en.wikipedia.org/wiki/Dye-sensitized_solar_cell https://en.wikipedia.org/wiki/Dye-sensitized_solar_cell https://actu.epfl.ch/news/epfl-s-campus-has-the-world-s-first-solar-window https://actu.epfl.ch/news/epfl-s-campus-has-the-world-s-firs... Non-native English speaker here: Is there a word to describe something which is transparent but alters colour?