Milo held his phone up to a maple tree and grinned as a shimmering fox made of blue light blinked into existence on his screen, sitting in the crook of a branch that, in the real world, held nothing at all.

Glimmer captured: Ember Fox. Collection: 214/300.

He’d been chasing this one for three days. The app had teased it near the reservoir, then the fountain, then finally here, on the gravel path that cut through Hollis Park. He snapped the photo, watched the little creature dissolve into a burst of pixel-confetti, and felt the small, stupid, wonderful joy of a thing checked off a list.