person holding a camera with a flash extending out the rear of it
https://social.v.st/system/media_attachments/files/112/542/500/654/729/362/original/0c1fd8af683b674e.jpeg
@janamarie reminds me a bit of the "Image Fulgurator", an art project that modified a 35mm camera to hold a slide and a flash behind it. The flash triggers when it senses someone else taking a flash photograph and projects the slide through the camera lens onto the other person's scene.
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