# Photo — Swap collage

Two photographs split the frame but trade places: each half wears the other's blow-up while mirrored windows swap the missing patches back.

Source: https://steevepommier.com/motion/photo-swap-collage/
Section: Motion
Published: 2026-08-01
Tags: 2d, interactive

---

The canvas is halved and the pair crossed — one half filled with the other
photo enlarged, and vice versa. A rectangle sits on each half at mirrored
positions, and through it shows a patch belonging to the opposite side, so the
two windows literally exchange what they cover. Clicking re-seats both windows
at once, and the blow-ups swell slowly as each pair's turn elapses.

The exchange is exact rather than decorative: each window samples precisely the
region of the opposite half's background that its twin hides, through the same
cover-crop mapping, so edges line up when a window hugs the seam. Photos are
consumed in fixed pairs — first with second, third with fourth — each pair
holding the frame for an equal share of the loop.