Here's the question you clicked on:
Hellozariah
how do you know if something is on the same plane ?
if you see them sitting somewhere on your plane or see them walking to the bathroom then theyre probably on the same plane
Pretty much any two points can lie on the same plane it's just a matter of perspective.
|dw:1358814819903:dw| there you have your three dimensional planes.
|dw:1358814887745:dw|I made another plane! :D