This is the whirleygig. It is double-sided and each propeller spins independently from the other. The whole top also rotates. Each propeller has 9 LEDs on the outside and 3 LEDs on the inside.
3 second exposure
6 second exposure
6 second exposure
6 second exposure with a slight rotation
6 second exposure with full rotation while spinning
6 second exposure with some rotation and slowing spin
6 second exposure - I stepped into the frame to rotate the whirleygig - my ghost image is on the left side!
6 second exposure
4 second exposure - the back propeller started to wind down and actually reverse direction
2 second exposure
6 second exposure
6 second exposure
3 second exposure
1 second exposure