[srtjstjsj]

That a much better explanation than the OP article.

It's like an isometric view of a video game. (But not exactly, since the angles are different)

A tall thing and a lower thing nearby it are protected onto the same spot. (Usually in a video game the tall thing blocks the behind thing, instead of blending with it.) Blending the two images makes the front-looking thing look transparent, when in really you are seeing around one object (since the observation angle is not the same as the imaginary viewing angle of the image) and then drawing both objects in the same pixel.