Come un fuso

Freely adapted from Oliver Sacks' "The man who mistook his wife for a hat".

From the text:

‘Problem? No problem—none that I know of ... But others keep telling me I lean to the side: “You’re
like the Leaning Tower of Pisa,” they say. “A bit more tilt, and you’ll topple right over.” ‘
‘But you don’t feel any tilt?’
‘I feel fine. I don’t know what they mean. How could I be tilted without knowing I was?’