If you take a look at the picture carefully you will able to see that the guy is riding the cycle but he is not
Via

Very clever advertisement by DHL, show us how to deliver a package from one place to another just turn a page transparent.

Shadows and Some characteristics of the photograph, make it seem that the screws are floating, when they are on the ground.
Also see Floating People

Can You Find the 14 Horses in this illusion?
Also see Find the 16 Hidden Faces in LG's Poster
What do you see first? Green arrows that are directed to the right? Or yellow arrows that go to the left? 
Whatever you see, it's an optical illusion that plays with colors and directionality. Experts Says That this effect is Associated with the Hemispheres of the brain. If you see the arrows that go first to the right, exercise more is that the left hemisphere and vice versa.

If you see the Pipes Above You Will Find that it creates a illusion of convex ball.
If you zoom in and out your eyes from the monitor, the picture above causes the illusion of spinning.
