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I don't think Richard is discussing cataloging actual physical cosmic cubes in the real world, I read his post as adding information about the appearances of objects in specific comic book issues. So, no need to make a new media type. Assuming that I am correct, I would think that the Appearances field would be the best place for this, although @Mark J. Castaneda and the CB editorial team would be the ones to decide whether that is an appropriate use of that field.