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Well, technically number spacing. I'm working on a project that involves the design of a very post-modern elevator panel, which, as you can see, has been set in Gotham (with counters filled) on a diagonal grid. Within each cell, the idea is that the letters are right-aligned and intersect with the bottom edge:
The problem is the 1/4/7 column. Every other number has a relatively even, boxy shape that was easy to center. But my original plan was to align the right edge of 1, 4, 7 with each other vertically, then raise them to the same vertical height as the midpoint of the other numbers in their respective rows. My thinking is illustrated here: