Based on the terminology, this likely refers to a specific Finnish women’s harness racing event (or a mare’s race classification) from the 1997 racing season, with “okru” being an abbreviation for lähtö (heat/race) or possibly a track code.
Reviewers describe it as a "meditation" that captures the very essence of womanhood through beautiful, playful, and sometimes disturbing visuals. naisenkaari 1997 okru