Naturally the idea is to explore new concepts a mix of diagrams and coding,

Basically what Brett Victor in recent times, and others have been trying to do for decades,

"Grail on Rand Tablet from 1968 demo"

https://www.youtube.com/watch?v=2Cq8S3jzJiQ

Or "Programmable Ink" at Strange Loop 2022,

https://www.youtube.com/watch?v=ifYuvgXZ108

There used to exist a graphical based Lisp for iPad, Lisping, unfortunely the app is long gone as it wasn't kept up to date with the OS.

Here is on old thread discussing it, https://news.ycombinator.com/item?id=3802131

The new iPad Calculator, is a more recent example of such ideas.