Cool magnet flip trick

I don't know enough to confidently explain this one. Who's willing to teach me?

For the students, here's the basics:
https://www.khanacademy.org/science/biology/energy-and-enzymes/the-laws-of-thermodynamics/a/the-laws-of-thermodynamics
https://physics.info/qcd/
http://mathworld.wolfram.com/Matrix.html