Very cool. (yes, long, but worth it). Great way to visualize task saturation. I appreciated his comments about how, after you do "three balls" for a while, things slow down to where you have extra mental cycles to utilize... exactly like flying. Early lessons = "what the H3%$?!?!"; later, you can fly, talk to ATC, navigate, estimate your fuel at destination, understand what the wind is doing, listen to your passengers, scope out emergency landing fields and still enjoy the view.
P.S.--Did you see the triangle thing? That guy must be LETHAL at raquetball!