By the way! Inside the ball is a dark liquid, the same as in the Carter cylinder. A polyhedron with twenty triangular surfaces floats in this fluid. Each facet has an answer. The ball has a transparent window through which the answer to the question asked is visible. The two hemispheres are connected very firmly so that air cannot get inside when shaking. Using such a magical design is very simple. Shake the decision ball, ask a question and read the answer.