Typographic Science Book Cover Grid

2x2 grid, 16:9, do this for 4 non-copyrighted science books: t1 mark-purity (master) support(image) ⊆ ∪_{g∈font} mask(g). the only drawing primitive is a glyph. ¬t1 = a stray stroke, a solid fill, a halftone dot, a hairline rule, an outline. (= your no_non_letterform_marks, made hard) t2 value-via-metrics local ink density ρ(x,y) = f(size, leading, tracking, weight) and ρ ≈ v*(x,y). shadow = small+tight+heavy ; midtone = nominal ; highlight = large+airy+loose or a flow-gap. value produced by anything else (a fill, a tint, a drawn gradient) ⇒ ¬t2. t3 contour-flow baselines = integral curves of a flow field f derived from the subject's form/contour; the flow carves the macro value - silhouette edges & bright highlights = gaps between flow lines. t4 prose-integrity glyph sequence along reading order = the prose stream consumed in order (contiguous), size ≥ s_min(legible), tracking ≥ t_min(readable). you may not reorder/drop letters to hit a value. ⇒ the two readings share one mark-set: far = gestalt(v*), near = the words. (your emergence ⇄ legibility duality) t5 period-coherence typeface ∈ era_set(author, publication_era); one ink value; substrate = aged paper. η honest type letterpress impression / ink bleed / ligature & kerning oddity = proof it's set type, not a drawn forgery. forbidden = ¬t1∨¬t2∨¬t3∨¬t4∨¬t5 = drawn outline · halftone · solid fill · rule line · value-driven letter choice · garbled non-prose · anachronistic face · 2nd color