At Chapultepec, a huge area with parks, museums, fairs, etc., a group from a special tribe (I forgot the name, sorry) performed a ritual act. They sit on top of a tree (which here is of steel), the one on top makes music, and the four others wind themselves down on ropes, spinning around the pole exactly 52 times (which is sort of a sacred number, as it representes different meanings). I made a movie of that as well, watch out!