My son wants to know how we can perceive light and it not take up any space at the same time.
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Light pushes objects all the time. However, the light that do the majority of the pushing are not detected by our eyes. The light that our eyes can detect have too low energy to do much pushing; but the amount isn’t really 0, just way too small to be noticeable. The light that do the bulk of the actual pushing is what we perceive to be “object occupying space”. When you push a wall and feel a resistance, a huge part of that is the light from the wall pushing against your hand.
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