Is What I See What I Get? — Math & Optics in Type Design

Every so often, I’m preoccupied by the question, “Is what I see also what I get?” I catch myself thinking that there’s a discrepancy between what I “saw” and the information my eye actually took in.

The differences between reality, what I see, and what I think I see are especially important to consider when dealing with type. A simple yet fascinating example of a “misperceived” reality can be found in the optical perception of horizontal and vertical bars of the same width. In Detail in Typography, Jost Hochuli states:

For a given weight of line, a horizontal line appears heavier than a vertical line. To achieve optically balanced verticals and horizontals, which appear to be of the same weight, the horizontal must be somewhat narrower. This applies not only to straight lines but also to curves … 1