D'alar'cop and Rand al'Thor wake up and find themselves trapped in a square shaped room. Suddenly, all four walls start moving at the exact same time, and each of them moves at the same speed towards the center of the room. D'alar'cop and Rand al'Thor realize they will eventually be crushed, but they are surprised that the walls aren't colliding with each other at the edges. Explain how this is possible.
- The ceiling and floor do not move.