Here's the theory : https://github.com/johnalexandergreene/Geom_Kisrhombille/blob/master/README.md

Here's an indifferent quality sample at Vimeo : https://vimeo.com/241051006

Here's the pristine video file : https://www.dropbox.com/s/1hkw47oqrxfitiv/forsythia_spinner_720p_2017_10_31.mp4?dl=1

Enjoy!