So convinced was he that the external world was the result of a vast deception practised upon him by the gross senses, that when he stared at a great building like St. Paul's he felt it would not very much surprise him to see it suddenly quiver like a shape of jelly and then melt utterly away, while in its place stood all at once revealed the mass of colour, or the great intricate vibrations, or the splendid sound... which it represented in stone.