unfortunately doesn't work for me because of difficulty visualizing things, so I suppose there are probably a good number of people with the same problem.

So I guess for one particular subset of the population it is difficult, impossible to understand, and because it cannot be understood it will not be remembered.

Not complaining just noting the amusing thing that different explanations may have all sorts of problems with it.

Although if there was a video of it I guess I would understand it then. Not sure if everyone with visualization issues would though.