While magazine editors still attend to “the mix” — the sequencing of articles, the balance of text and images — online readers consider all that obsolete hocus-pocus. Magazine décor used to make readers feel protected, at ease and thus receptive to advertising — in their well-appointed New Yorker place, say, or their coffeehouse Nation place. But online we build lean-tos from whatever is around, often relying on the artless scaffolding supplied by search engines and browsers.