Len/Mathematics runs on Cuis Smalltalk. Which has the goal of being small and easy to understand and extend. So it should be to your liking. I found the differ

Len/Mathematics runs on Cuis Smalltalk. Which has the goal of being small and easy to understand and extend. So it should be to your liking. I found the difference of the image with the book similar to little exercises to test what I had learned so far. Also being able to easily introspect the code of what you are interacting with is what makes Smalltalk easily discoverable in my experience. Disclaimer: I only dabble with Smalltalk every now and then.