"This?" Adric asked, holding up the book before popping open one of the crisp packets, giving a slight shrug. "This is child's play. They're still only working within three dimensions," He said, popping a crisp into his mouth before turning the packet toward Jack.
"And it's hard to say exactly. Shouldn't be possible, but hell if I know," Adric said, shrugging. "The Doctor didn't even have any idea what was going on. Best explanation he could come up with was magic."