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AH, THE DAYDREAMS of the gentle iPhone app designer. His reveries roam a sun-dappled land where we users give his app our full and adoring attention. Our fingers swipe, tap, pinch, twist, and flick across the screen with the grace of ballerinas. We instantly understand every icon, tap effortlessly through every screen, take note of every button, and have easy command of all iPhone conventions and gestures. We understand the app because we study it and luxuriate in it just as much as the app designer does.