You can switch between the two easily by imagining a lever on the back of the characters head vs front of their head - press up to push the lever higher for the back vs lower for the front. Same goes for planes etc
Not the OP, but in formal definitions like Communicating Sequential Processes, concurrency means the possibility for tasks to run out of order and still be correct, as long as other synchronisation events happen
Not to mention keywords such as ret, inl, imm, mut, mat and even yon - 'readable' is certainly subjective. Not to dissuade anybody from trying anything outside the norm but I wonder if calling it readable is accurate.