Across the lagoon, a child chased a paper butterfly made of discarded transparencies. It fluttered and bent in the wind, and Mara watched for the moment when its trajectory would intersect with her permitted vector. The key’s entropy budget allowed this much unpredictability but not the spontaneous generation of new species. She skirted the child’s path with attention, adjusting micro-steps that the registry would later compress into a clean log: deviation +0.03, corrective phase applied −0.03, net entropy change +0.0007. The ledger would show an escape that respected boundaries.