re: Send prayers for rain

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Like OKR said, basically what it does is match the color of the edges of the screen, and after a while your brain sort of "fuzzes" the boundary of the TV in your peripheral vision to give you a larger and more immersive image.

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My son bought some online, on Temu, I think. I was very skeptical, mainly due to the source, but we put them on the TV in the bonus room. It works well, but as you said, the room has to be dark.