Picking in the couch in the shape of the buttocks of Alexei allows him not to slide from the couch at angles of the slope of the couch up to 60 degrees! This allows you to use a sofa on a ship with a storm of 7 points, in a building with an earthquake of up to 6 points, as well as as a cockpit for a Formula 1 car, and even as an astronaut's seat when bringing Alexei into orbit! Science and Life 2012 :)