That's when you know for a fact that the glass is full.
If the glass is already full, I don't see the reason to change the path and look for other ways to fill the glass.
i get that. as you said before when you realized your questions are flawed and there are an underlying problem and the solution, your glass is full.
my question was when you would know this glass is not filling up with the current path, so you have to find another?
