a point when one thing turns into another, or tries to embody explain or pass for said idea

First of all you've got the concept of a Tipping Point, when one thing tips everything over, sort of casting the deciding vote and catalyst of a mass wave of change. What the final straw does to a camel's back.

Tipping Point could refer to the point of a propogation of memes, which are ideas from simple concepts to behaviors to religions, that humans are triggered to replicate. Charles Dawkins came up with the Memes concept, which is itself a Meme, and it's an idea that I'm propogating. Albeit lazily.

Its been used to refer to white flight when a certain number of black families moved in, in urban areas in the 1960s. Morton Grodzins was a pofessor of Political Science of the University of Chicago, and he wrote about the Tipping Point in The metropolitan area as a racial problem, which was explaining the sudden creation of the racial problem of poverty, isolation and desperation of America's inner cities.