Ah, let us step into this crack here for a moment (it's roomy enough, once you're in it, and the time passed there doesn't count)and be informed about the Hemispheres. The two Hemispheres were very old and of disputed origin, and they were prized possessions of the college. In form, each was a perfect sphere, and yet they were called hemispheres: It was said they had originally existed in the same spherical space and that they had then been separated. They were of heavy glass, each at least a meter in diameter. One of them was crammed with creatures, rats, rat-faced people, proper people; but their faces were bigger than their bodies and the eyes were bigger than the faces. They seemed alive and avid to burst out. Most of the bodies and faces and eyes were cracked and shattered (you know that it was done by an eye-cracking sound), broken like glass and the pieces falling out of them. yet they seemed alive and flexible, not rigid. They didn't seem at all miniaturized, but there were hundreds of them in that hemisphere.
The other spherical hemisphere was all green meadows and game-parks and cities and oceans, unoccupied, but waiting for visitation.
Ah, out of the crack again. But be careful: Don't mention that stuff.
-R. A. Lafferty, 'The Man Who Walked Through Cracks' (1978)