A feather from the whippoorwill
galleries are sunrise
Dickinson switches the usual metaphor—instead of the bird singing *about* nature, nature becomes the architecture of its song. Galleries = exhibition spaces.
emerald nest the ages spin
The nest isn't built by the bird but by time itself. 'Spin' makes geological time sound like a spider's work—slow, continuous, delicate.
beryl egg
Beryl is a pale blue-green gemstone. She's making the egg both precious and unattainably high—'overhead' means heaven, not just trees.
"recess" overhead
The quotation marks matter. Recess = break from school, but also a recessed space. Heaven is the ultimate playground, forever out of reach.