The average Hackaday reader likely knows, at least in the academic sense, what a magnetic field looks like. But as the gelatinous orbs in our skull can perceive only a tiny fraction of the EM ...

The actively controlled levitation base uses a magnetic sensor to detect the changing field as the snail moves ... This is picked up by a circuit in the snail, and used to power the LEDs inside.

Like ZrTe₅: It combines a rare set of non-trivial electronic properties, making it potentially relevant for high-precision electronics applications and magnetic-field sensor technologies.