You would view it in a nearly-dark space. And the lights on different moving parts would blink at different frequencies and your eye would be trying to work out the structure & pattern of movement, starting from very little information, to eventually enough to see it
Or even better, it’s just lights turning on gradually. At first it appears to be a single circle being inscribed by one light. But then another light comes on showing that is in fact two degrees of freedom, synchronising to create a circle at the first point. Then another light — it’s 3 degrees. Etc.