letters are always wearing some kind of clothing, and are always expressing themselves thus. Even neutral clothing express neutrality.
It is true that the letters of the alphabet are abstractions. A particular impression of a letter on a particular piece of paper, whether through printing or writing, is something concrete.
A typeface is also, to a limited extent, abstract, but it closely defines a particular physical realization. (And if one is picky about the "correct" meaning of font, a 20a pile of lead, or a computer file ending in .otf, is something concrete too, although not a written representation of a letter.)
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