Percariously placed rocks in Humber River perplex

The mystery of who is solved. The mystery of how, though, has onlookers scratching their heads. Since 39 rock sculptures were found in the Humber River near the Old Mill on the weekend, 48-year-old Toronto photographer Peter Riedel has been identified as the creator. What still has people puzzling is just how they stay standing so precariously “without glue.”