When you use your zoom, the camera takes a picture of a more narrow portion of what the camera normally sees without the zoom. For example, when I take a picture of the night sky without zooming, even a full moon looks very small. When I want to take a picture of the moon, I use my zoom to take a picture of the narrow portion of the sky around the moon. How narrow the portion of the sky depends on how much my camera can zoom. The more I zoom, the more narrow the view of the sky I see in the camera and the the larger the moon looks. The moon isn't getting any bigger, and I'm not getting any closer to it; I am just looking at a more narrow part of the sky.
"Angle of view" is the phrase for how wide or narrow the camera can see, and for most cameras this is adjusted with a zoom lens. A wide angle of view lets us see a lot of stuff, useful (for example) when shooting pictures at an indoor birthday party. A narrow angle of view lets us see a smaller amount of stuff, useful (for example) for shooting pictures at a baseball game.
What happens when we are taking pictures of different objects, some of which are close to the camera and some of which are further away? (Farther away? Help me grammar nerds!)


This technique can also be used to make little boys look like they are giants crushing famous, distant landmarks. My boys will discover this someday and will be greatly amused by it. Until then, though, I will use this technique to compose creative shots of the boys.
By way of another example, last summer I took a perfectly innocent picture of Sam splashing a board in the Chesapeake Bay:


I took the same picture this summer, but also included Boyd and a friend so they could be superheroes, too.

UPDATE
I found another image using this technique on a much larger scale at Creative Shots - MDOLCTNO Revisited.
El Niño Y Tu Pilin
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