How the ‘rubber pen’ trick works when you hold a pen loosely in your fingers and move it up & down rapidly that it looks like it bends
The way it was explained to me.
We do not see “in video” but in numerous still photos. The moving pencil trick works in the same way as wagon wheels with frame rates in older movies. Check it out.
Think of our vision as a giant, live, flip book. Look in a mirror and try to see your eyes move.
Your brain lies to you. Vision isn’t as neat and ordered as you think. There are gaps in our perception, and the brain just fills in the missing information.
If you wiggle the pencil fast enough, your brain can’t make out exactly where the pencil is, so it estimates. This is how most optical illusion work. They exploit blind spots, or weaknesses in our perception of reality.