a device that could keep one of these spinning in one of its phases constantly is just a matter of tuning, probably needs a little work but essentially what it would do is you'd tilt the table ever so slightly in one direction, and spin that tilt at a given speed and the result would be the disc would not stop being in the state the speed is tuned to, and it could be under 1mm of tilt required, making it imperceptible until you get up really close to see the mirror shifting the surroundings