Leonardo da Vinci St John the Baptist

Leonardo da Vinci St John the BaptistLeonardo da Vinci Madonna with YarnwinderLeonardo da Vinci Madonna Litta
And yes! The world he saw through that window was not his own: the ground was closer here, and the landscape was not green fields and hedges but a desert of rolling dunes.
He closed it and opened another: the smoke-laden air over an industrial city, with a line of chained and sullen workers trudging into a factory.
He closed that one, too, and came back to himself. He felt a little dizzy. For the first time he understood some of the true power of the as to the angel. "So it's not as easy as I thought. We were just lucky in Oxford and Cittagazze, maybe. But I'll just..."
He picked up the knife again. As well as the clear and obvious feeling he got when he touched a point that would open to his own world, there had been another kind of sensation he'd touched knife, and laid it very carefully on the rock in front of him."Are you going to stay here all day?" said Balthamos."I'm thinking. You can only move easily from one world to another if the ground's in the same place. And maybe there are places where it is, and maybe that's where a lot of cutting-through happens... And you'd have to know what your own world felt like with the point or you might never get back. You'd be lost forever.""Indeed. But may we...”"And you'd have to know which world had the ground in the same place, or there wouldn't be any point in opening it," said Will, as much to himself