Frequently the woods are pink
hills undress
Personification of seasonal change—trees losing leaves in autumn expose bare hillsides. The sexual overtones are typical Dickinson mischief.
cranny / Where it used to be
She's watching familiar trees disappear—either cut down or dying. The "cranny" (gap, hole) marks absence where a crowned treetop once stood.
twelve performed
The punchline: Earth's "wonderful rotation" isn't a full spin but twelve months completing one orbit around the sun. She's redefining what counts as rotation.