Following the recent "AI Debate" between Yoshua Bengio and Gary Marcus [0], there was a lot of discussion about the exact definition (or redefinition even, as some argued) of some labels like "deep learning" and "symbol" (what do we mean exactly by these?), I find that it is quite relevant to this discussion.

[0] https://www.youtube.com/watch?v=EeqwFjqFvJA