I just had a dream of making a laser show with a fleet of quadcopter stability drones moving XYZ mirror positions in sync. Then use wireless sync of mirror positions to beam positions for many complex arrangements and movements beyond the galvo's capability...
Of course many safety considerations are necessary such as only firing the beam to the mirror when the quadcopter position is confirmed a safe angle. Much hardware and software checks and programming around safety would be necessary. Then of course put this in a big room and close the door with the camera in it until its proved safe enough for human eyes..