How often did you hear that Zooming with your legs is not like zooming with your lens? They were right!
This video demonstrates how different focal lengths control the distortion of the human face, assuming of course that the face take the same amount of space in the frame.
It is quite an interesting and experiment, and really easy to replicate at home, if you don’t believe the stuff you see on the internet.
How Lens Focal Length Shapes the Face & Controls Perspective [The Slanted Lens]