In 1972 Massimo Vignelli and Unimark International redrew the New York City subway as a pure diagram: every line a flat saturated color, every angle locked to 45° or 90°, every station a round dot on a strict black grid. It treats the city as an abstract circuit board rather than a literal map.

This system distills that landmark of information design — solid black field, trunk-line colors verified against the 2012 MTA reissue, uniform-weight strokes, and white Helvetica labels — into a digital design language of clarity, alignment, and uncompromising flatness.