Merseberg Wheel 
                           Weissenstein Wheel 
                            
                                      Designs of Orffyreus’ perpetual motion machine were
                           similar and indeed simple.  Once Orffyreus himself remarked: "It is so well designed that it is not necessary to stop
                           it to carry out repairs or servicing." However, in order to prevent one to have any easy access to understand his machine,
                           he intentionally produced complex designs.