Don’t spend too much time examining the man’s clothes, the fence or the bundle he’s carrying.Atmospheric Science
Instead, look at the snow.
Then compare what you see around the dog with what you see around the man.
Got it?
The Answer: The Man Isn’t Leaving Footprints
The dog has clearly left paw prints behind as it walks through the snow.
The man, however, appears to have left no footprints at all.
That’s the mistake.Magazines
If the snow is soft enough to record the dog’s paw prints, we would ordinarily expect the man’s shoes to leave visible tracks as well. Yet the snow behind him appears undisturbed.
Why Is It So Easy to Miss?
The puzzle works because the overall scene feels completely natural.