The wierd lines effects that appear on photos of computer/tv screens.
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Your TV’s screen is made up of pixels, with lines in between them.
Your camera’s sensor is also made up of pixels, with lines in between them.
When the TV’s lines and the camera’s lines don’t line up, or are different sizes or spaced differently, you get odd extra patterns that show up. This is called the Moirè effect. Basically, you’re seeing one set of lines overlaid on another set of lines, and so you will see a different periodic shape that’s the difference between the two line spacings.
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