[phumbe]

You beat me by two minutes on the aspect ratio bit :)

Here's another good video showing wingtip vortices: https://www.instagram.com/p/BhzCLgFnVzL/?hl=en&taken-by=edse...

Not sure what you mean by "energy created by propulsion." The vortices result from low pressure on top and high pressure below making the air want to curl around. That imparts downwash on the wing, reducing its effectiveness.

[kgilpin]

I mean that the airplane’s propulsion system is ultimately the power source behind those vortices, by forcing the wing through the stationary air.