system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it easy to read something you're holding and almost impossible to read something someone else is holding?

Hands shake in both cases, but they seem extra shaky if someone else is holding the paper or phone.
gpt
Hand-eye coordination. Your brain knows when and how your hands shake, so your eyes can easily keep up with that movement as it happens. If someone else is holding something, you're relying solely on visual cues and trying to react to them.