Demonstrated By: Tel Aviv University, 2011 viral demos
What Happens:
A high-temperature superconductor, when cooled with liquid nitrogen, can lock itself in space relative to a magnetic field. It resists vertical and horizontal movement — effectively “levitating” in mid-air or sliding above a magnetic track. This is due to quantized magnetic flux tubes being “pinned” in place.

The Idea:
The vehicle (superconductor) is physically coupled to the external field (magnetic source) and cannot move unless permitted by changes in the field geometry. It’s a form of “magnetic lock.”