When taking a picture of a screen there are these weird lines that when viewing the pic in different sizes or resolutions causes different lines to appear
In: 6
[when two grids interlace, visual patterns emerge from the junction](https://upload.wikimedia.org/wikipedia/commons/e/e3/070309-moire-a5-a5-upward-movement.gif)
You are seeing the grid of the camera sensor over the grid of the screen.
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