I think Forth is unique in that you actually can be both high-level and low-level productive in a single "system", but I can also see the perspective that high-

I think Forth is unique in that you actually can be both high-level and low-level productive in a single "system", but I can also see the perspective that high-level Forth is more of just a concatenative language than a high level Forth as such. Regardless I think Forth's power is that it can be both a very low level language or a high level runtime.