This is a really cool trick, but once you know how it was done it will amaze you even more! This guy had a lot time to do this video 
I created this illusion by placing a chair in the middle of the room and shining a bright light on it which created a shadow. I cut black poster board and taped it so that it covered the shadow. Then I moved the light source to the opposite side of the room and shined it on the chair which created another shadow. Again, I cut black poster board and taped it so that it covered the shadow. Then I just removed the actual chair from in between the 2 shadows. The whole process took about 10 hours.
Behind the scenes
