HOLLOWTWIN: Every Pose Opens One Hall and Blocks the Other

HOLLOWTWIN is an original portrait-first positive/negative silhouette chase. Each paper screen exposes three structural bands: Head, Heart and Foot. Press Crown, Arch or Low. If both occupied bands are cuttable, that exact body silhouette is removed from the upper hall and the same conserved paper becomes a solid obstacle in the lower hall. The Paper Saint advances through the hollow while the Ink Bailiff takes two real pathfinding substeps through the accumulating solid twins.