Eli5: when looking around a room your eyes jump from point to point, but when following a moving object they move smoothly. Why can’t they move smoothly when scanning a room?
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It’s not that your eyes *can’t* move smoothly when scanning, but rather that your eyes (and brain) want to focus on **something**. As you scan a room, your focus moves from point to point.
If you imagine an object moving steadily across the room, you can usually smoothly follow the imagined object.
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