PARIS — Performance artist Abraham Poincheval is in the midst of spending seven days inside a massive, 12-ton rock at the Palais de Tokyo gallery. <br /> <br />Poincheval is well known for his feats of endurance such as traversing the Rhone River inside a large corked plastic bottle, spending six days on a platform 20 meters in the air just outside a Paris train station, and living in a cramped space inside a stuffed bear in a museum. <br /> <br />On Feb. 22, Poincheval stepped inside the human-shaped hole carved into the rock, where he would sit and wait for a week. The aim of his stunt is to discover how the unique experience will transform his perception of time and space. <br /> <br />In there, he’s got food supplies of water, soup, and dried meat, and enough room to keep a diary of his experience. Poincheval will be using water bottles to collect his pee, and there’s a container for him to defecate into. <br /> <br />If he survives his week in the rock, Poincheval says his next feat of endurance will be to sit on a dozen eggs for four weeks, waiting for them to hatch.