Making a shot out of a photograph
Stripe Sessions 2023 needed a moment about Shenzhen. What existed was one small black-and-white archival photograph, and the default treatment for a still in a keynote is the Ken Burns effect — a slow push or drift across the image, borrowed from documentary, which creates movement without creating depth.
It works, and it is invisible in the sense that nobody objects to it. But it also announces that you had a photograph and nothing else. On a stage that size the bar wanted to be higher.
Why a push across a photograph never reads as a place
A camera move over a flat image moves every part of that image at the same rate. Real depth does the opposite — near things sweep past, far things barely shift. That difference is parallax, and its absence is what the eye registers as flatness even when it cannot name the cause.
Adding more push does not add more depth. It adds more of the same wrong thing.
Projection mapping
The approach instead was projection mapping: treat the photograph as a slide in a projector, build rough geometry in the shape of what the photograph depicts, and throw the image onto it.
The geometry does not need to be accurate or detailed. It needs to be *separated* — the foreground at one distance, the mid-ground behind it, the skyline behind that. Once the image is living on surfaces that sit at different depths, a camera move produces real parallax, because the near planes genuinely are nearer.
The photograph stops being a picture of a place and becomes a set dressed with that picture.
What you inherit, and what you owe
Projection buys the geometry for almost nothing. What it costs is everything the original photograph could not see:
Occlusion. A building projected onto a card has no back and casts nothing behind itself. Wherever the camera reveals a gap the original never showed, that gap is empty and must be filled by hand.
Baked light. The photograph's shadows are painted into the texture. Move a light in the scene and it will disagree with the shadows already in the image, so the scene lighting has to be matched to the photograph rather than invented against it.
Resolution. A small source stretched across depth falls apart fastest on the surfaces nearest camera — exactly where the eye goes. Which constrains how far in the move can push before the illusion thins.
Every one of these puts a ceiling on the camera move. The move is designed against the limits of the plate, not chosen first and defended afterwards.
What it became
The value was not the one shot. Sessions 2023 carried other archival imagery, and this established the method for all of it: separate, project, fill what the move reveals, match the light to the plate, and let the constraint set the camera rather than the reverse.
A photograph is not a picture you move across. It is a texture, and a texture wants a surface.