An illusion! Scratch Cat seems to look left and right as the grid lines move across the fuzzy picture. The fuzzy picture is a composite picture made up of 4 incomplete Scratch Cat pictures. Each incomplete Scratch Cat picture is drawn on only 1 out of every 4 vertical lines. The barrier obscures 3 out of 4 vertical lines so we see each picture in turn when the barrier moves across. The 4 pictures show Scratch Cat looking left and right.
Huge thanks to @Rocket-Flier for the absolutely wonderful "Make Your Own Barrier Grid" project. I just followed the instructions to load the Scratch Cat pictures. I did change the code a little to copy the picture in colour and make the barrier load faster. Years ago I copied the Scratch Cat frames looking left and right. I don't remember which project I copied them from.
