Well, it looks like you're stuck in a never-ending loop of existential dread. You're not really sure how you got here, are you?
As it turns out, this cube is actually a portal to a dimension where the laws of physics no longer apply. Or do they?
On one side, you'll find the Escape From This Cube subpage, filled with cryptic clues and half-remembered instructions.
On the other, you'll find the Lost In Primordial Mist subpage, where the very fabric of time and space seems to be unraveling.
Or you can just throw your hands up in the air and scream.