| 摘要 |
A die includes a first, sealed cube having six transparent, window forming faces. A second cube within the first cube has six insignia bearing faces, each in register with and in relatively close proximity to a corresponding face of the first cube. An optical shielding liquid within the container fills the container so that when the die is at rest a transparent bubble is formed between an upper, horizontally disposed insignia bearing face and the container face in registration with the upper face. The shielding liquid obscures all of the other insignia bearing faces. In a second embodiment, a randomly selected, upper face of a polyhedron, buoyant in an optical shielding liquid, is guided so that it is close to, but spaced from, and in registration with a horizontally disposed window on an upper wall of a sealed container for the liquid by guide walls of the container, as well as bosses on the polyhedron. The shielding liquid fills the container so that a transparent bubble is formed between the upper face and container window. In both embodiments, the bubble is confined between the upper container window and the upper, insignia bearing face to wipe the shielding liquid from the window and face, thereby enabling the insignia to be clearly seen.
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