Perspective

http://www.georgesrousse.com/en/archives/article/georges-rousse-in-ruesselsheim/

French artist Georges Rousse photographs anamorphic images in abandoned and derelict buildings.

When the scene above is viewed from the right vantage point, it looks like this:

http://www.georgesrousse.com/en/archives/article/georges-rousse-in-ruesselsheim/

This video shows him at work on a project in Miyagi Prefecture, Japan, in 2013: