Yah this happens because the image is based on a grid. You can see it on any monitor if you open it up in an image viewer and zoom in an out. As another commen

Yah this happens because the image is based on a grid. You can see it on any monitor if you open it up in an image viewer and zoom in an out. As another commenter mentioned these effects are called Moiré patterns: https://en.wikipedia.org/wiki/Moir%C3%A9_pattern https://en.wikipedia.org/wiki/Moir%C3%A9_pattern They may be more or less apparent depending on the scaling on the image and the scaling algorithm being applied. Some scaling algorithms apply filters that can make the effect even more weird than normal.