gorilla arm

gorilla arm

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 afterward. 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?".
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Folded down to a 20-degree angle, the display finds a second role, as a giant tablet, allowing the user to interact with it more easily without the risk of "gorilla arm," the sensation of heaviness felt after a few minutes of operating a touch screen with one arm raised out in front of the body.
Another model wore a sparkling swimming costume with feathers down one side and a fake gorilla arm holding an ape mask on the other.
"These players have to understand, our testing is accurate and we have a zero tolerance policy when it comes to gorilla arms," said Commissioner Selig.