The Machine #3 - Bucket's' O'water

They looked up at the split sky.

"Looks like we might've been lucky."

"How so?"

"The energy state of the Universe next door looks like it's the same as ours."

"What, like an alternative reality?"

"No, no, no. Our Universe contains all its own alternates. In a multiverse, each one is unique. If the one next door had a different energy state, then we would have been really screwed."

"Eh? Why?"

"Think of it like poking a hole in a bucket full of water. If the bucket is in water, nothing comes out. If it's not, all the water leaves."