GPT
Turning Your Head treats the ghost in the corner as a trick of speed and perception, something almost transcendent but probably only fast enough to fool you.
The poem is fascinated by the threshold where repetition creates apparition. "Possibly a transcendence / Not necessarily" is the key correction, refusing easy supernatural certainty. The final instruction is almost comic in its method: keep turning your head, and misperception itself will manufacture the ghost.
Claude
'Turning Your Head': ghost in the corner, faster than a cat can touch, maybe transcendence; keep turning your head a lot and you'll see a ghost. A deliberate prescription for second sight.