The camera views the world through an unmoving vertical slit, taking successive shots over time. The left side of the image here corresponds to the earlier shots and the last sliver on the far right is the most recent. It's a time-panorama. The background didn't move, so is smeared out, but the farmer and his buffalos passed by. If the farmer had stopped for a while in front of the slit he would appear elongated; had he raced past the camera, he would appear compacted.
Slitscan imaging techniques are used to create static images of time-based phenomena. In traditional film photography, slit scan images are created by exposing film as it slides past a slit-shaped aperture. In the digital realm, thin slices are extracted from a sequence of video frames, and concatenated into a new image.
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