Themes

Shows the Consequences of human discovery and invention- The anti gravity machine ends up killing one of the men who helped invent it.

Nature comes back into its own- Eventually the two men realize that gravity shouldn't be tampered with, you can not change gravity or else there is always consequences.

"But what about a single Billiard ball, entering a zero gravity field from one particular direction? Does it come out in the same direction or in any direction?"(343).