In "10 Principles of Nervous System Function", principle 1 states that:

The Nervous System Produces Movement Within a Perceptual World the Brain Creates

This can be a difficult concept, that the world we experience is only a approximation of the world as it actually is.

Watch the following TED talk.

https://www.ted.com/talks/keith_barry_does_brain_magic?referrer=playlist-how_your_brain_constructs_realLinks to an external site.

How can Principle 1 relate to what you see happening in the video. No right or wrong answer!