His basic principle wasthe broken-window theory: If you don't fix one window in the building, another will be broken and then another, and eventually the whole block will be lost.
In this case, the "seen" was a shopkeeper's brokenwindow that would create economic growth for the shopkeeper hiring a glazier to replace thewindow, with the glazier spending the money earned elsewhere.
Geoffrey de cided to place an old, slightly exotic-looking, artistically shaped radiator, which he had removed for a client because it wasbroken, in thewindow of his workshop, just to make it look like a shop.