"There is no characteristic difference between a person's signature on a baseball, and on a flat.
The pen is held in the same way--just look at photos of Ruth or Gehrig signing baseballs, and signing their contracts.
The baseball is rotated as the person signs, so that the pen always makes contact at the same level--just like on a flat."
I think it's common sense that we sign a baseball differently than we sign a flat piece of paper. Pick up a ball and try it; it's absolutely certain. Maybe more so for some than others, but definitely different.
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