I think this passage says it all. Quoted from So Long and Thanks for All the Fish by Douglas Adams:
His house was certainly peculiar, and since this was the first thing that Fenchurch and Arthur had encountered it would help to know what it was like.
It was like this:
It was inside out.
Actually inside out, to the extent that they had had to park on the carpet.
All along what one would normally call the outer wall, which was decorated in a tasteful interior-designed pink, were bookshelves, also a couple of those odd three-legged tables with semicircular tops which stand in such a way as to suggest that someone just dropped the wall straight through them, and pictures which were clearly designed to soothe.
Where it got really odd was the roof.
It folded back on itself like something that M. C. Escher, had he been given to hard nights on the town, which it is no part of this narrative’s purpose to suggest was the case, though it is sometimes hard, looking at his pictures, particularly the one with all the awkward steps, not to wonder, might have dreamed up after having been on one, for the little chandeliers which should have been hanging inside were on the outside pointing up.
The sign above the front door said “Come Outside,” and so, nervously, they had.
Inside, of course, was where the Outside was. Rough brickwork, nicely done pointing, guttering in good repair, a garden path, a couple of small trees, some rooms leading off.
And the inner walls stretched down, folded curiously, and opened at the end as if, by an optical illusion which would have had M. C. Escher frowning and wondering how it was done, to enclose the Pacific Ocean itself.
“Hello,” said John Watson, Wonko the Sane.
Good, they thought to themselves, “hello” is something we can cope with.
“Hello,” they said, and all, surprisingly, was smiles.
“Your wife,” said Arthur, looking around, “mentioned some toothpicks.” He said it with a hunted look, as if he was worried that she might suddenly leap out from behind a door and mention them again.
Wonko the Sane laughed. It was a light easy laugh, and sounded like one he had used a lot before and was happy with.
“Ah yes,” he said, “that’s to do with the day I finally realized that the world had gone totally mad and built the Asylum to put it in, poor thing, and hoped it would get better.”
This was the point at which Arthur began to feel a little nervous again.
“Here,” said Wonko the Sane, “we are outside the Asylum.” He pointed again at the rough brickwork, the pointing, and the gutters. “Go through that door” — he pointed at the first door through which they had originally entered — “and you go into the Asylum. I’ve tried to decorate it nicely to keep the inmates happy, but there’s very little one can do. I never go in there myself. If I ever am tempted, which these days I rarely am, I simply look at the sign written over the door and I shy away.”
“That one?” said Fenchurch, pointing, rather puzzled, at a blue plaque with some instructions written on it.
“Yes. They are the words that finally turned me into the hermit I have now become. It was quite sudden. I saw them, and I knew what I had to do.”
The sign read:
“Hold stick near center of its length. Moisten pointed end in mouth. Insert in tooth space, blunt end next to gum. Use gentle in-out motion.”
“It seemed to me,” said Wonko the Sane, “that any civilization that had so far lost its head as to need to include a set of detailed instructions for use in a package of toothpicks, was no longer a civilization in which I could live and stay sane.”
He gazed out at the Pacific again, as if daring it to rave and gibber at him, but it lay there calmly and played with the sandpipers.
“And in case it crossed your mind to wonder, as I can see how it possibly might, I am completely sane. Which is why I call myself Wonko the Sane, just to reassure people on this point. Wonko is what my mother called me when I was a kid and clumsy and knocked things over, and sane is what I am, and how,” he added, with one of his smiles that made you feel, Oh. Well that’s all right then. “I intend to remain.”
“I’m not trying to prove anything, by the way. I’m a scientist and I know what constitutes proof. But the reason I call myself by my childhood name is to remind myself that a scientist must also be absolutely like a child. If he sees a thing, he must say that he sees it, whether it was what he thought he was going to see or not. See first, think later, then test. But always see first. Otherwise you will only see what you were expecting. Most scientists forget that. I’ll show you something to demonstrate that later. So, the other reason I call myself Wonko the Sane is so that people will think I am a fool. That allows me to say what I see when I see it. You can’t possibly be a scientist if you mind people thinking that you’re a fool.”