And in case the kid did not understand the idea of compound interest, Dad provided a literal example, complete with a sign on top of a 1000 foot pole made from old-growth sequoias.

Of course, it's not a mountain made of money. Those are large bills glued to a mountain. Real money would not pile up like that, and unless it was put to work through some investment vehicle, it would actually have its value eroded by inflation.

Also, I'm trying to think of any tall geological formation whose name ends with mount, instead of uses it as a preface.