Story summary.Earth passes through a peculiar region of space where causelty no longer holds & physics is weird. Earth is not necessarily solid & can randomly change phases. You can pick up a chunk of air & eat it, or ride it! Etc.
Most men died out. Few survivors are in two groups: organisms are thoughtless with random spur of the moment action. Relicts are rational of the old but are fast dying out - since this world has not rationality & doesn't tolerate rationality.
That's when the universe inexplicably returns back to a state where the effect follow the cause & rational men can claim the world again.
Fact sheet.First published: Infinity Science Fiction, July 1957.
Related: Stories of Jack Vance.