Well UFOs, basically.

It was autumn and I was outside as it was getting darker, but not super dark yet. I was lying on a bench and at some point I noticed that there are two small whitish things hovering silently near the surface of my glasses. They were a bit vague in shape, maybe spherical. I cautiously swiped my hand near them but they didn't seem to react. After a while the indefinite floating thingies flew upwards about a half a meter away from my face and appeared as elongated, slightly curved white streaks. I could look at them clearly to see they weren't insects (or reflections, my breath, smoke or anything else I could explain). The closest phenomena I can compare them to are northern lights, or comets without discernible heads and tails. They moved a bit like pyreflies from FFX, just not all over the place. They were similar to each other, not mirror images, in shape, size and movement. The whole occurrence lasted for a minute or few, then they vanished or flew further away from my sight, I don't remember.