A closer look at epaper, often called eink. And with closer I mean supermacro of course...

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The color grid technology by E Ink is named "Kaleido". The technology in the picture frame is ACeP or "Gallery 3" also by E Ink. They recently released a version with 6 pigments but this is not available yet (sept 2023).

Good article about the history of epaper:   / thehistoryofelectronicpaper