Damon Knight: "The Indigestible Invaders," "Backward, O Time" and "An Eye for What?"

We recently read a story from the October 1956 issue of Infinity by Harlan Ellison, and I noticed that advertised on the cover of the issue is a story by Damon Knight I have not read. So let's read it! And two other stories Knight published in the same period. We've already read a bunch of stories by Knight printed in 1956; "The Country of the Kind," "Stranger Station," "The Beach Where Time…