lost wax cast bronze roman dodecahedronA Roman dodecahedron, also Gallo Roman dodecahedron, is a small, hollow object made of copper alloy, cast in the shape of a regular dodecahedron with twelve pentagonal faces. Each face has a circular opening of varying diameter in the center, which is connected to the hollow interior. In addition, there is a small protruding knob at each corner. These mysterious objects date from the 2nd to the 4th century AD. They rarely show wear and do not contain