I see what you're saying in the sense of passive energy collection, but perpetual motion strikes me as a terrible metaphor. Perpetual motion would imply so many thing about the universe that solar can't deliver.
For the purposes of anyone reading this, you can make a perpetual motion machine using solar power. I'm pretty sure modern engineering and materials are sophisticated to make a machine of some sort that collects energy during the day and stores it over night in order to continuously move for...I don't know, several hundred, several thousand years? Nothing overly sophisticated, since I wouldn't necessarily trust bearings or motors or hinges to last that long, but something that performs work without needing to be touched for multiple lifetimes.