Strange Inventions Lab made a book of every possible image at a tiny resolution, along with an Image Locator Camera that returns a page number instead of a photograph. The 512-page physical book contains all 512 possible 3×3 black-and-white pixel patterns. The camera reduces a scene to nine pixels and displays the page number for the matching pattern.

It neither saves the photograph nor searches the book. It calculates the page number directly from the pixels. The concept also works at higher resolutions and in color, but complete physical books for those modes have not been made.