Imagine standing in the middle of some rail road tracks. If you look to the horizon, the tracks will converge at a point. This is the law of perspective.
Now imagine the rail road tracks not converging -- rather the space between the rail road tracks seems to be the same, all the way towards the horizon.
What would those non-converging rail road tracks look like -- say from an aerial view?
ponzo illusion
bubble
collaspe
