Who or what answers?
I may have to go back and get a better photo. Here, it seems to be a disenframed portal, floating magically vertical in the darkness; it's actually up against a tree and in daylight, looks as if it might be a door in. --You knock, I read about wood sprites as a child and I am not gonna bother one!
T. R. MCELROY'S STREAMLINED TELEGRAPH KEYS
7 months ago