A Cross-Cross-Section is a constrained epistemic construction made by selecting heterogeneous materials from a larger field and forcing them into a precise relation. A section may bring together a concept, an operational marker, a historical work, an archival fragment, a bibliographic reference, a botanical specimen, a DOI, a video, a material condition, a scale, a temporal process, a sensory register and an ecological dynamic. Its purpose is not to display variety or to reduce a field to summary. It is to produce a proposition that becomes possible only through the crossing. The resulting text is therefore neither excerpt nor collage, but a local demonstration in which distant materials are made analytically comparable without being treated as equivalent. The method rests on a simple epistemological premise: knowledge appears not only in stable objects, concepts or disciplines, but also in the transformations that occur when one regime of evidence passes into another. A classification can become a spatial rule; a material threshold can become a perceptual boundary; an archival absence can become an institutional symptom; a botanical process can sharpen a temporal concept such as latency, persistence or decay. The Cross-Cross-Section isolates such passages, tests them across heterogeneous evidence, and formulates their conceptual residue as a proposition. Its force increases through repetition. One section is an experiment. One hundred sections constitute one hundred singular propositions. Together they do not form a master summary of the field; they create a distributed set of epistemic landmarks through which recurrent mechanisms, exceptional conjunctions and distant affinities can be compared. The method therefore replaces total synthesis with serial, constrained demonstration.