The tipping point is "the moment of critical mass."
In simple words, the tipping point is when something gets so "heavy" that it tips over.
Physicists can calculate this with precision. Sociologists, studying social trends, cannot.
The question I have regarding the last photo below is, "Can one person be the tipping point?"
PS: beavers are not physicists.
The photos were taken along the Mississippi River, Minneapolis, between the Lake Street and Franklin Avenue bridges.