Reversible Figure-Ground Illusion Generator

2x2 grid, 16:9, ai picks clever but lesser known subjects, select visual_output from latent_graphic_systems where dual_percept = [entity_a, entity_b] and illusion_type = 'reversible figure-ground' and contour_topology = infer(shared_outline from entity_a_profile, entity_b_profile) and fill_rule = 'positive/negative space exchange; one percept black, the other white' and drawing_rule = 'no internal detailing except what defines the shared boundary' order by perceptual_reversals_per_minute desc, instant_ambiguity desc, figure_ground_balance desc, minimal_extraneous_cues desc limit 1;