What Is Tilt-Shift Photography?
Tilt-shift photography uses a lens that can tilt relative to the camera sensor, narrowing the plane of sharp focus to a thin band and blurring everything above and below it heavily.
Why it looks miniature
Our eyes associate a very shallow depth of field with macro (extreme close-up) photography, since that's normally the only way to get such a narrow focus band. Seeing that same shallow-focus effect applied to a normal-scale scene tricks the brain into reading it as tiny.
Classic subjects
Cityscapes shot from above, crowds, and busy scenes with lots of small repeated elements (cars, people) sell the miniature illusion best — a single close-up portrait doesn't read the same way.
Getting the look without a specialized lens
Digital tilt-shift effects, applied through editing or AI restyling, replicate the narrow focus band and blur convincingly without needing the actual specialized (and expensive) lens hardware.
Does tilt-shift only work on wide landscape shots?
It's most associated with them, but the same narrow-focus-band effect can be applied to portraits or closer scenes for a more surreal, stylized result.