How about smells? I’m not sure how many different smells the human nose can recognize (there is some debate apparently, but that seems good enough for basic communication), and how long it takes for one to replace the other, but this could be a nice “secret” mode of communication (if everyone use it, the world will smell like a shitty perfume shop).
How about smells? I’m not sure how many different smells the human nose can recognize (there is some debate apparently, but that seems good enough for basic communication), and how long it takes for one to replace the other, but this could be a nice “secret” mode of communication (if everyone use it, the world will smell like a shitty perfume shop).