This short story deals with a spaceship crew, but they slowly realize that the spaceship they are on is actually some type of experiment, I think.
Ever so slowly, one crew-member, a female, begins to figure it out. It seems that whenever she looks outside the viewing port she notices different, strange things/scenes.
In the last part of the story she is looking out the port and instead of seeing stars and planets she sees a swarming mass of organisms on the viewport surface. She realizes that something is amiss, and runs off to her sleeping quarters and curls up to conceal herself.
And in the last paragraphs one of the other crew-members comes to console her, and tell her everything is OK.