"Horocycles of Light": https://youtu.be/U7FzyYVvdNY . In this video, one can see the experiment of formation of the Horocycles of Light, along with some details of the experimental apparatus and the main idea of the concept of Horocycle applied to the magneto-optics of a Ferrocell, which is a thin film of ferrofluid subjected to an external magnetic field in the presence of light sources.