“Yes Folks! It’s existential humor night here at the Cartesian Comedy Cave, where you wait staff will cheerfully chain your facing the rear wall and you can join us as we play “Name That Shadow”!
Watching shadows like that is like watching television. Aside from a little lens distortion, everyone sees the same image.
Looking at objects in real life, no two people can ever see exactly the same image.
“That house on the hill, can you see what color they’ve painted it?”
“It’s white on this side.”
.
Pays to be a careful observer.