polyhedron(points=[
[0,0,0],
[10,0,0],
[10,10,0],
[0,10,0],
[0,-20,20],
[10,-20,20],
[10,-20,30],
[0,-20,30]
],
faces = [[0,1,2,3],[4,5,6,7],
[1,2,5,4],
[2,3,6,5],
[3,0,6,5],
[0,1,4,7]
]);