We define

polyhedra to be
adjacent if the polyhedra have no common interior points and two faces (one on each polyhedra) intersect in a polygon that has positive area. Can

polyhedra be arranged so that every pair is adjacent?
I tried generalizing the problem, said it was way too difficult, tried the 2D version of the generalization, and then thought I came up with what I believe is an intuitive proof for the 4 Color Theorem without using a computer (I still have no clue why my "proof" can't be made to be rigorous...). In short, any help would be appreciated.