Sorry, but I have just watched it. I didn't invent what I said. Just to avoid any misunderstanding, I am talking about words that appear on the video itself, at the bottom of the picture, not the words "Perspective, not curvature" that appear below the picture. The first words that appear on the picture are "A Flat Football Field." This changes to "The man starts disappearing from the bottom on a flat surface."
"The man starts disappearing from the bottom on a flat surface."
I tried using "print screen" to insert a still from the video clip to show you, but I could not make it work.