3m x 3m squares, if I've correctly remembered the dimensions, mean you can distinguish not only Shite Bunker from Johnson's Idol Hell, not only different blocks within those, not only individual rooms within each block, but different corners of your own student room. fake.concentration.lolz is your desk, musty.stink.fugg is your bed, etc...
(They hadn't got as far as Hollybush Lane, they were wandering around the multi-million mansions on Julian Road)