 Zeus accordingly displayed his own cleverness by enchanting the boulder into rolling away from King Sisyphus before he reached the top, which ended up consigning Sisyphus to an eternity of useless efforts and unending frustration.Thus it came to pass that pointless or interminable activities are sometimes described as "Sisyphean".King Sisyphus was a common subject for ancient writers and was depicted by the painter Polygnotus on the walls of the Lesche at Delphi.