Hello, Word Artists and Admirers! Even before I knew there was a phrase for it, I loved the idea of liminal space. Those are times and places where things are not strictly one thing or another. Merriam-Webster defines it as 1: of, relating to, or situated at a sensory threshold : barely perceptible or capable of eliciting a response 2: of, relating to, or being an intermediate state, phase, or condition : in-between, transitional. And this fandom wiki expands on the idea with several examples.
As for me, I remember first encounter the idea of it as the time that Bert the Chimneysweep sang about in Mary Poppins ('ardly no day an' 'ardly no night) and how that description filled me with delightful shudders.