Cubic window in the corner of a building

Free on GOG.com today:

https://www.gog.com/game/ultima_underworld_1_2

https://www.gog.com/game/syndicate

https://www.gog.com/game/syndicate_wars

(better with audio)

(made by students from the Filmakademie Baden-Württemberg, not a real advertisement. Audio very much required)