Depth Perception(Monocular cues)

The monocular cues are used to judge depth perception

Relative Size
                       When two objects are the same size the object that appears larger will be the closest one, which is why the larges car appears to be the one in front.

Relative Motion
                             is when we perceive a stationary object to be moving when we are moving the closer the object the faster it seems to use. The picture below is trees being passed up by a train the trees look like they are zooming past but actually the train is the one that is moving.