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The Skylab experiment spider cage. This is not the actual flown experiment box, but is described as "identical to the ED52 web formation experiment apparatus" (NASM collections ID #A19740484002).

The accompanying sign reads

Spider Web Formation Experiment
Skylab

One of 19 student experiments aboard the Skylab space station in 1973 examined spider web formation in zero gravity. Astronauts monitored the activity of spiders released into this box. At first their webs were rather sloppy, but they soon became more regular as the spiders adapted to weightlessness.

Transferred from NASA

Also note the actual spider Anita in the vial at right.