Tx-transform

tx-transform is a film technique and software developed by Austrian filmmaker and media artist Martin Reinhart. It represents a specific implementation of slit-scan photography, in which one of the spatial axes of an image is interchanged with the time axis (t). Normally, each frame of film depicts the entire spatial scene at one instant in time. In a tx-transformed film, each frame instead contains the entire duration of a shot but only a narrow section of space – for example, when cut along the horizontal axis, the left side of the image represents the “before” and the right side the “after.”

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.