This is the ejaculation face of the stump tailed macaque.

You have Charles Bonnet syndrome.

And you have Charles Bonnet syndrome.

She said, Who is this Charles Bonnet?

The Charles Bonnet ones are quite different.

And this Japanese macaque has made a snowball, and he or she's going to roll down a hill.

I'm not crazy. I'm not demented. I have Charles Bonnet syndrome.

And she said, Tell all the nurses that I have Charles Bonnet syndrome.

And in the Charles Bonnet syndrome, you don't go to those higher levels.

There is none of this quality of being addressed with these Charles Bonnet hallucinations.

Now with the original description in the 18th century, Charles Bonnet did not have them.

This was originally described, I said, right back in the 18th century, by a man called Charles Bonnet.

Charles Bonnet said, 250 years ago he wondered how, thinking these hallucinations, how, as he put it, the theater of the mind could be generated by the machinery of the brain.

So in the Charles Bonnet hallucinations, you have all sorts of levels, from the geometrical hallucinations the pink and blue squares the woman had up to quite elaborate hallucinations with figures and especially faces.

Neurologist and author Oliver Sacks brings our attention to Charles Bonnet syndrome when visually impaired people experience lucid hallucinations. He describes the experiences of his patients in heartwarming detail and walks us through the biology of this under reported phenomenon.