Technical LEGO: Fluorescent ravographs

When I showed these Spirographlike fluorescent hypotrochoid generators to my son, he said that the light show was straight out of a rave. Though rather vague as to how he knew this, he assured me that ravers would know exactly what he meant. I still needed a name for these gizmos, as Spirograph is still a registered trademark, so ravographs they were. Each ravograph is a basically a singlestage planetary transmission with a long input shaft coupled directly to the planet carrier. There is no sun gear