The documentary also features creation of S.A.C.R.E.D. which premiered during the 2013 Venice Biennale .
S.A.C.R.E.D. is an artwork featuring sculpture dioramas of Ai 's time in prison .
The documentary also features creation of S.A.C.R.E.D. , an artwork featuring sculpture dioramas of Ai 's time in prison , which premiered during the 2013 Venice Biennale .