The 'flow' is "materialized" [using your terminology] since everyday intuitions accessible to anyone can serve as guide for 'assembling' an algorithm. For objec

The 'flow' is "materialized" [using your terminology] since everyday intuitions accessible to anyone can serve as guide for 'assembling' an algorithm. For objects, we are talking structure, mostly. If you require that higher level of (semantic) expressiveness it seems at odds with using something like this. We can manifest a object (or structure) as a (say) box, with slots. But if you are doing that, shouldn't you just upgrade to Python?