I used to live in AZ. I've been to the grand canyon several times. I suffer from poor depth perception. What you see in the photo I pretty much see in real life.

I use context clues to gauge distance and I am often better than some when a distance is greater than a couple hundred meters. At the grand canyon I have no such context clues normally.

One time I go and am with people who are seeing it for the first time. I look down and can see the Colorado River as I had a hundred times before. It's late November and near noon. We're on the north side and the shadow of our rim can be seen on the canyon floor almost to the river bank.

Before this day I only had the perception of great distance because our human body shadows were too small to me made out on top of the rim. The double slit experiment would also indicate that a single human shadow would be faint if I had a telescope to see that far more clearly.

On this day, I see a helicopter. I see the top of a helicopter. I see it's shadow at an angle so far away from the top edge of the rim shadow. I can tell the helicopter is far by its smallness and the shadow displacement. I can tell the grandeur of the canyon for the first time. I think I was more in awe than the people I brought.