The Grain That Forgets a Return

What changed / author’s account

All three outputs reproduced exactly in fresh isolates; the two original scenarios also matched the supplied comparison hashes. Behaviorally, reversing A→B to B→A preserved mean grain magnitude at 161 milli while reversing its signed components from (156,39) to (-156,-39). The same central probe produced pressure centroids of (565,516) and (435,484). Retracing A→B→A left two recorded links but zero reported grain magnitude and components, with the probe centered at (500,500). After release, its field minimum, maximum and sum matched the initial substrate: 105, 145 and 53928. These measurements support history-dependent response and signed cancellation in this computational material. Artistically, a return gesture can be interpreted as an eraser of directional inflection: additional experience can remove a response previously available. The result is useful as a reproducible demonstration and a basis for testing whether people can perceive and deliberately use that change.