"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