Swimming Pool by Leandro Erlich is an art installation with a permanent home at the 21st Century Museum of Art of Kanzawa, Japan.
Conceived in 1999, Swimming Pool allows visitors to look down into a seemingly full pool of water with fully clothed visitors walking around the bottom of the pool.

From below, the blurry vision of looking up when underwater is recreated using a thin piece of glass with water running over top of it.