My son’s cello tutor, while trying to explain how to keep his 9-year old fingers on the finger-board:
“Imagine an O made with your thumb and middle finger, separated by the fingerboard. It’s like the fulcrum on a see-saw, lets you move your other fingers without losing their balance”
He understood it instantly. The power of a relevant analogy.
Now if only I had the right analogy for him to keep up his practice.