Thanks, Mark, for mentioning the milkweed pods (in yesterday's comments). I'd forgotten about these pics I'd taken earlier. They're not from my "walk", but they were taken during the "golden hour" another evening.
For those of you who don't know, this is what milkweed seeds look like in the pod. These happen to be exposed because I'd run over the pod with the lawn mower (the plant was leaning over onto the ground).
The pod contains all those seeds, and when it opens on its own, the seeds get blown around on this silky, fluffy stuff, and they spread far and wide.
The above photo was from another pod hit by the mower, and I took it only to show the pretty "fluff". When a pod opens naturally, each seed floats around in the air via its own bit of fluff, not in a big clump like that.
Incidentally, if you look VERY CLOSELY at that above pic, in the bottom right quadrant, you will see a super-tiny pinkish star-shaped flower. Cool, huh? I didn't even notice it until I was editing the photo.
Back to the milkweed seeds... here's a size comparison for you:
They look rather golden in that sunlight, too, don't they?