"Sisyphus" by Je est un autre In Greek mythology Sisyphus was a king of Ephyra. He was punished for chronic deceitfulness by being compelled to roll an immense boulder up a hill, only to watch it roll back down, and to repeat this action forever.
One Way Colour Tunnel by Olafur Eliasson. This is a tunnel made up of light-shattering translucent and reflective triangular panels of coated acrylic, iresembling a walkway of stained glass. This is at the San Francisco Museum of Modern Art.