The speaker hands over their spare change to a blind man who is "testing the rain," holding out a palm or a cane to feel whether it's falling. It's a small, odd moment of exchange, and the image sticks: one person who can't see the weather reads it by touch, while the speaker seems to be moving through the world in a different, more dreamlike way.
The second part widens out. "Everywhere a wing" suggests the speaker sees, or imagines, wings all around, maybe birds, maybe something more imaginary. Nobody else notices them. That leaves the speaker feeling alone with what they perceive, "weary and high." The title, "Psychonaut," hints at someone exploring altered states of mind, so "high" may mean intoxicated, but it could also mean lifted up and light-headed. The mood is quiet, hazy, and a little lonely: wonder and tiredness mixed together, with a gentle sense of being slightly apart from everyone else.