Though, one has to wonder if your arms would get tired. A commenter on Hacker News brought up Alan Kay’s famous quote about the “light pen”
By the way, Sketchpad was the first system where it was discovered that the light pen was a very bad input device. The blood runs out of your hand in about 20 seconds, and leaves it numb. And in spite of that it’s been re-invented at least 90 times in the last 25 years.
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