These very interesting installations were installed by Heike Weber. Drawn with highlighter on Acrylic placed on the walls and floors of buildings, on large surfaces up to 600 square meters.
See below for some more examples. They give some optical illusion effects, and without the comparative scale of the windows and doors, it would be hard to tell the actual size of them.
On his website you can see numerous other works by Heike. Not all are as practical as illustrating the walls and floors of buildings, some are more “traditional” prints. Take a look for yourself, it’s pretty amazing stuff.