Paradox Orrery

grabcad

This is a model of a paradox orrery. If you rotate using the middle cog, you get the idea of it working. In reality, you are meant to move it via the fleu de lis, but I can't get it to operate that way. The idea is based on a concept by James Ferguson. The paradox is one dial moving forwards, one backwards and one stationary when all are turned by a single cog due to the gear ratios.