Now you're thinking with portals.
Trippy Chrome Ball Through Portal Hole Kinetic Sculptures

These are several video examples of artist Damien Beneteau’s Spherical Variations, chrome and matte black balls on a pendulum that pass through a lit portal, producing some pretty trippy visuals in the process. And you know how I feel about trippy visuals! “They scare you.” They’re absolutely terrifying. Isn’t life already frightening enough without having to worry if reality is failing?