“Everybody thinks that he knows an A when he sees it; but only the few
extraordinary rational minds can distinguish between a good one & a
bad one, or can demonstrate precisely what constitutes A-ness. When is
an A not an A? Or when is an R not an R? It is clear that for any
letter there is some sort of norm. To discover this norm is obviously
the first thing to be done.”

—Eric Gill, An Essay On Typography, 1936.