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-gorilla arm
-
-n. The side-effect that destroyed touch-screens as a mainstream input
-technology despite a promising start in the early 1980s. It seems the
-designers of all those spiffy touch-menu systems failed to notice that
-humans aren't designed to hold their arms in front of their faces making
-small motions. After more than a very few selections, the arm begins to feel
-sore, cramped, and oversized the operator looks like a gorilla while using
-the touch screen and feels like one afterwards. This is now considered a
-classic cautionary tale to human-factors designers; Remember the gorilla
-arm! is shorthand for How is this going to fly in real use?.
-