From: http://www.bottomlayer.com/bottom/basic_delayed_choice.htm I refer to the above picture of the double slit experiment. I wonder what you would get if you added a third detector 5C in between 5R and 5L? Presumably you would get zero detects, because when you check the which-path, the interference pattern is non existent. Which is to say that all of the photons traveled in a strait line through either the right or left slit to land at 5R or 5L respectively. What if you had many very tiny detectors in a grid? Would an interference pattern emerge? I say this because, the screen upon which the interference pattern is observed is made of molecules. Each molecule acts as a sort of detector, changing it's properties when light hits it, correct? Has anyone heard of an experiment done along this line, or know of a reason why not?