You see that my friend and I are jumping, and a Samurai is coming out.
You are right but actually you aren't! :P
Here is the same picture, but from another angle.
We didn't jump but laid on a floor! The Samurai and all the things in this picture is painted on walls.
It's called "Trick art". We are tricked because of optical illusion.
I took this picture in a Trick Art Museum in Odaiba. There are a lot of trick arts which you can take some pictures with and enjoy. I recommend you to go there if you haven't been such a place.
It's very fun!