Twitter slapfights don’t usually get me thinking, but this one did. Regardless of whether you think Noad’s experiment is successful, interesting, ill-conceived, self-aggrandizing, or something else, his intent — like any designer’s intent — was simply to create something useful. As a visual display, the London Underground diagram/map (don’t hit me, Erik) has a use: to help someone see where they are and decide where they’re going. That’s the end; its map-ness or diagram-ness is simply the means. Matching ideal means to useful ends is “what a designer does.” But if a redesign doesn’t preserve the purity of the original, successful means (in this case, Beck’s diagrammatic approach) does that make it an a priori failure?

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Designing is often described as “solving,” but isn’t it more about engaging?

I agree with Spiekermann to a point — I don’t find the London Underground diagram confusing as-is, and adding “some” map-like geographic accuracy (but not “all” of it) could easily send a very conflicting message to the user about what to expect, and how to use the display. But here’s the thing: the Underground diagram already does send very conflicting messages — it’s constantly saying, “I look like a map, but I am not one. Psych!” And yet if you ask 100 people what the London Underground display “is,” I’ll bet cash money that 100 people will call it a map. Because that’s its use. And if it’s use-ful in that way, aren’t designers’ definitions about what it “is” or “isn’t” simply academic?

Spiekermann (who also designed Berlin’s subway diagram) is right that we “misunderstand” the London Underground diagram when we think of it as a map. But so what? If that misunderstanding makes no huge difference to its usefulness — which is probably the case for most people, who use the diagram (and think of it) in a basically maplike way and get on fine — the misunderstanding is moot, neutral, meaningless. But if that misunderstanding does make a difference — for example, makes it more difficult for a user to do what they want to do, which is see where they are and see where they’re going — isn’t that a shortcoming of the design, not the person? And if that misunderstanding is indeed “common,” as Spiekermann says, mightn’t it make sense to bring the design more in line with users’ maplike expectations? Maybe, maybe not. That was what Noad was experimenting with.