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So I have been working the last year or two on a Grotesk sans-serif, and have recently started on my italics.
After referencing a few other grotesks, I've noticed that the slant angle is always about 2-3 degrees less on round characters like C, O, e, etc...
So for instance, say on a roman weight of a sans the characters like I, L, H, N, etc.. have a slant of 12 degrees, it seems like 9 times out of 10, characters like C and O are only at a 9 degree slant.
My question is, what is the reason for this, and is it a discretionary thing for the designer or something that is pretty well known as needing to be done in the type design world.