Commonplaces: Dementia

… on emerging into the open air once again, I was saddened to see, in one of the otherwise deserted aviaries, a solitary Chinese quail, evidently in a state of dementia, running to and fro along the edge of the cage and shaking its head every time it was about to turn, as if it could not comprehend how it had got into this hopeless fix.

The Rings of Saturn
W.G. Sebald