Well not _only_ two things, but the idea is that you need to specify _relationships_ between objects. You can't do that by just considering each object in isola

Well not _only_ two things, but the idea is that you need to specify _relationships_ between objects. You can't do that by just considering each object in isolation. - "A goes TO THE LEFT of B" - "The header goes ABOVE the content" - "The list goes INSIDE the table" - "The menu goes BEFORE the advert" You could try and combine more than two objects together in a single rule, but it's obviously easier to specify the rules one pair at a time. A layout language without prepositions isn't much of a layout language at all.