Several nondescript objects sit on a desk.  Couldn't be simpler, right?  Well, as the below video — the latest opus by Youtube illusion extraordinaire Brusspup — demonstrates, looks can be deceiving:

The technique is called anamorphosis and dates back at least as far as the Renaissance.  The image is distorted and elongated so that it appears natural only from a certain angle.  (It's a style often used on the sidewalk paintings of artists such as Julian Beever and Kurt Wenner.)

Brusspup heightens the illusion by placing the photo-realistic images alongside regular objects, and then using video to reveal the perspective change in real time. Very cool.

See more of Brusspup's illusions on his Youtube channel.