That's an important quote for photographers, because it's so very true.
It's the same with music, by the way: We listen to little of what we hear. Any musician can tell you that.
I experienced the "looking/seeing" difference while on an expedition to Antarctica. We were riding around in a Zodiac when I noticed an interesting ice formation (bottom photograph). I said, "Look, look," w/out saying what I saw (top photograph). Only two of the eight people in the Zodiac saw it: an ice sculpture of a polar bear - complete with eyes, ears, nose, mouth paw, knee and foot!
I asked the Zodiac driver to maneuver around the ice formation to find a "cleaner" view of the ice sculpture. We found one, and we all took the same photograph of what I believe is the first sighting of a polar bear in Antarctica.
Explore the Light,
Rick