In terms of Smalltalk, the answer is "yes". Some examples of what it looks like include the original Self language / environment [1], Newspeak [2], and even Ton

In terms of Smalltalk, the answer is "yes". Some examples of what it looks like include the original Self language / environment [1], Newspeak [2], and even Tony Garnock-Jones' implementation of Actors [3]. Some of this has to do with the fact that the virtual machine for many Smalltalk implementations is implemented in Smalltalk itself. So you can start with Smalltalk and end up with something modified enough to be considered different. [1] https://selflanguage.org/ https://selflanguage.org/ [2] https://newspeaklanguage.org/ https://newspeaklanguage.org/ [3] https://tonyg.github.io/squeak-actors/about.html https://tonyg.github.io/squeak-actors/about.html