I think I'd argue that the bottles are more actually dancing than the buildings are drooping, IYSWIM.
But yes, verbs like "squat" and "droop" are verbs of motion, and yet we also use them for non-moving, if that makes sense - so they can work for static things. "I squat on the the floor" could imply the process of squatting down, or it could just be a statement of your posture. And you couldn't quite say "the shack ran towards the river" without seeing something with legs, but you could say "the shack drooped towards the river".
One of the things about that Bowen passage, too - as the comment trail points out - is that actually almost nothing is happening, physically, inside the bar. They can hear things, outside, reflections of the lights rock, the bottles dance, "a distortion runs through the view"... how's that for abtractness?
It is only through inanimate things becoming sort-of animate, that the brute physicality of what's going on beyond the walls, comes into the bar.
And did I mention that Elizabeth Bowen is a great writer?
Hope you're enjoying it, Jem!