Video of the Day: Parkour and Optical Illusions
Freerunners Jason Pauls and Pasha Petkuns climb around an upside down house and change in size.
Sportsmen challenge gravitation and walk on the walls of buildings, hover in the air and even climb a banana.
"Life as a freerunner means the whole world is your playground...or is it just one big illusion?" — the video description on YouTube reads.
You can find out on Red Bull website how they did it: