Entropy (Sleep) is part of “S.A.C.R.E.D.,” a part of Ai Weiwei’s 2013 submission to the Venice Biennale. The project includes six iron boxes, each holding a small diorama detailing his 81-day incarceration in 2011. Entropy (Sleep) showcases one of six parts of his never-ending observation and policing of his activities while in prison, from the bathroom to even sleeping in his own cell.