It's dusk at a park in Dallas, and white sheets are pinned up next to tall trees, fluttering like ghosts in the wind. They've been lit up with ultraviolet lights to attract moths.
A handful of people are holding up their smartphones, zooming in on the small dark specks that fly to the cloth.
"Bugs have become my obsession," says Annika Lindqvist. "And the more you look, the more you have to look at the tiny things, and when you blow them up you see that they are gorgeous."