You have to stay up until it's really dark.
But then it's quite a sight. On the Bornsesteeg on the far side of the campus, PhD researcher Koert Geffen is investigating the influence of artificial light on moths. Caterpillars (and later moths) from the cabbage moth to the feathered ear moth are camping in a kind of luxury prison. Plenty to eat, plenty of chance to play and mate, and no predators. The only snag is the lack of privacy.