I’ve heard that learning English isn’t easy, but I don’t really remember my own experience of doing so. Learning the difference between these four indefinite pronouns is just one of the many things to know, and seems to be a common grade school poster to hang up in the classroom.
- Anything
- Something
- Everything
- Nothing
Some use these four words together in a clever sentence or epigram, but today I’ve got nothing except this sad little diagram. I hope it is of some use to someone.
I also see this is done with anybody, somebody, everybody, and nobody, and there are some cute little stories out there too! Plus here’s another diagram.
Further Reading:
https://www.google.com/search?q=something+everything+anything+nothing&tbm=isch
https://www.google.com/search?q=somebody+everybody+anybody+nobody&tbm=isch
https://equivalentexchange.blog/2012/05/21/the-square-of-opposition/
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Equivalent eXchange 
Four states of material existence, boiled down to a most simplistic level. Probably the core language of those two iconic cartoon characters: Thing 1 and Thing 2.
I appreciate your comment. I am reminded of another related fourfold that you might enjoy:
https://equivalentexchange.blog/2014/05/09/notions-of-equivalence/
Trying to reply on a cell phone can be daunting. Especially when holding the phone in landscape orientation.
But the link you suggested was most interesting, if a bit beyond my IQ. I read some of it, however, and appreciate the consciousness expanding quality of your research. Forge on ahead!