Counter-rotating arrows Bloom zoetrope

Bloom zoetropes are an idea by John Edmark: A shape is put on a turntable and illuminated by a strobe light, so that there is one flash every time the shape has performed a rotation through the Golden angle.

After such a rotation, the shape, which is the union of a sequence of smaller shapes, stays almost the same, but each small shape has been replaced by its sucessor in the sequence.
Due to the strobe light, the whole sequence is seen as an animation of the small shapes performing all the same motion, but phase shifted.

With this particular shape, the smaller shapes are arrows. In the animation, they appear at the top center and travel outwards and then down the cylinder surface. They move back and forth a few times while changing the direction of their arrow head. This creates the impression of counter-rotating bands of arrows. Then the arrows dive back into the cylinder.

The video below shows the finished prototype in action. The flickering and other artefacts are due to the camera not being able to adecuately work under strobe light. The turnatable and strobe are controlled by an Arduino. The code that runs on the Arduino is available on my website.

Here is a link to another video that shows a computer simulation of what it will look like.