Core Skills: Moving Image (Deep Focus)

The term Deep Focus comes from Deep depth of field, otherwise known as the in an image is all in focus, the foreground, the middle-ground and the background. For research I found a video thats part of a film made by Orson Welles, called Citizen Kane (1941)
https://www.youtube.com/watch?v=Ksn_s-Aa_pQ

There were a few images that involve deep focus:

this shows a deep depth of field.

this image was from the Akeelah and the bee movie directed by Doug Atchison.