If you go to this site, you'll find something very similar to what apo is always going on about...

http://www.dichotomistic.com/index.html

Not that I agree with this Peircean triadic stuff, but yeah, it's out there. A large part of it feels like a nice story you know, but then I always question myself like "what have I actually learned?" and it's a little bit of a blank. Like yeah, cool story, but so what? There are a few Peircean thinkers in this semiotic vein it seems, but not that many in today's world. It's an interesting way to think about things, but I don't see it being very productive. More of a way to think about what we already know than to discover something new.