Spot on the wall works, it's not new, it's just another tool in the bag to choose from.
To teach tracks and learn systems I find 4 lasers are a must have.
There are imaginary visuals and there are visuals, some can see it and some can't.
The laser is an eye opener for many.
Learn the tracks, a little bit of math, and a lot of 3 cushion.
Take 2 aspirin and call me in the morning.