All rooms in Level 0 share the same superficial features, such as worn mono-yellow wallpaper, old moist carpet, scattered electrical outlets, and inconsistently-placed fluorescent lighting. Aside from these common features, no two rooms within the level are identical. Linear space in Level 0 is altered drastically; it is possible to walk in a straight line, return to the starting point, and end up in a completely different set of rooms than the ones previously passed through.