Magenta Panther
Well-Known Member
It's parallax, you dig?
Actually, I didn't, so I looked it up. According to Wikipedia: Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.[1][2] The term is derived from the Greek παράλλαξις (parallaxis), meaning "alteration". Nearby objects have a larger parallax than more distant objects when observed from different positions, so parallax can be used to determine distances.
Wiki also has a neat example of how parallax visually works.
![Parallax.gif](http://upload.wikimedia.org/wikipedia/commons/a/ab/Parallax.gif)