The author built a grayscale syntax highlighter that de-emphasizes code elements based on utility rather than syntax category. The core insight: comments and definitions warrant high visual weight because they answer "what" and "why" questions; control flow (return, throw, yield) deserves medium emphasis for structural scanning; baseline keywords (let, const) and punctuation fade to near-invisibility since they're mechanically necessary but semantically inert. The implementation uses only brightness/tone shifts on a black-on-white base, rejecting color entirely. The practical claim is that highlighting should serve attention allocation—letting eyes skip between meaningful pieces—rather than decorating all syntax equally. The author provides interactive examples showing how this rhythm guides reading through real code. The constraint of making a light theme work forced the rethinking; many dark themes succeed through vibrant color that masks poor hierarchy, whereas grayscale forces intentionality about what actually matters to a reader's cognitive load.