A hundred thousand witches and wizards were taking their places in the seats, which rose in levels around the long oval field. Everything was suffused with a mysterious golden light, which seemed to come from the stadium itself. The field looked smooth as velvet from their lofty position. At either end of the field stood three goal hoops, fifty feet high; right opposite them, almost at Harry’s eye level, was a gigantic blackboard. Gold writing kept dashing across it as though an invisible giant’s hand were scrawling upon the blackboard and then wiping it off again; watching it, Harry saw that it was flashing advertisements across the field. Goblet of Fire, page 96