DAVID: I guess some of my response is based on my own faith in the UI I have created in my mind. My UI is not a ditherer.-Thank you, as always, for your honesty. Let me help you. Forget the ditherer, and admire the inventor and experimental scientist.-DAVID: Your scenarios are not wrong. They fit, in their own way. They are too contrived for my taste. But then, I must remember, you need your picket fence, and the reminder that there are so many unsettled points to consider.-Ah, but in order to please you, I pretended to get down from my picket fence and accept the existence of a UI. But U and I do not see I to I even over a UI.