This is a tree in Potsdam, Germany that has people staring and staring. How is it done? Why is it blowing the minds of passers by and YouTube viewers?

Okay. here's the secret courtesy of The Huffington Post:

Graphic designer Daniel Siering and art director Mario Schuster teamed up to transform a natural form into a mind-bending illusion. With the help of some tin foil and paint, the creative duo camouflaged an unassuming tree trunk to fit the natural landscape that surrounded it.

In the video above, we can barely separate the painted trunk from the horizon, giving the unwieldy foliage the illusion of floating in mid air. In a sea of somewhat tacky optical illusions, this understated visual ploy is just the right amount op and art.

Would you like to see another amazing illusion?