system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How/why does tilt-shift make photos or videos look miniature?
gpt
Your brain is used to blurry backgrounds meaning you are focusing on something very close to you. Close one eye, hold a finger in front of your face and focus on it; the background behind your finger becomes very blurred. Now move your finger farther away; the background becomes less blurred.

Tilt-shifted photos/videos result in the brain being fooled to think you are looking at very small things, because that is what it expects when it sees a background so blurred with a sharp object in the foreground.