> Showing is usually engaging otherwise they wouldn't be there in the first place.

The problem is, e.g. if you as a teacher show music notation and show low, high, short, long notes on a blackboard, the student will forget what is shown if it does not fulfill a rather short term goal.

Engaging would be playing the piano together while watching and listening. The feedback loop of gratification is much shorter and we animals are programmed to learn well from short positive/negative feedback loops.