While this is a simplification, I often catch myself thinking: isn't programming creating functions and functions of functions and that all way down? And on each layer we call them differently because of the context we're in.

Input --> Stuff happens --> Output

Again, it's a simplification, although to be fair, I sometimes don't see how -- other than that I'm feeling that I'm ignoring context too much (e.g. underlying hardware or networks or REST API endpoints).

And not just programming - all of computing really. Logic gates are composed into more complex ones that are composed into even more complex ones and so on upwards.