"then his mind's eye looked up and caught his own image and realized where he was and what he was seeing and I don't know what really happened but the slippage that Phaedrus had felt earlier, the internal parting of his mind, suddenly gathered momentum, as do the rocks at the top of a mountain "
A month later...
"Little things appeared, like the locked door, the outside of which I could never remember seeing. And a slip of paper from the probate court telling me that some person was committed as insane. Did they mean me?"
Robert M. Pirsig Zen and the Art of Motorcycle Maintenance