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It's as if no one realizes their phone as a monochrome mode, which can be set as an 'accessibility' shortcut via simple button press.

Black and white kills the dopamine cycle and brings color back to your real life.

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I do this a lot when I am around my 6 month old daughter. We can already see a very clear difference in her engagement and curiosity when she sees a colored phone versus a monochrome phone. She grabs for the phone less and quickly returns to previous activity if she notices a monochrome phone.

I guess it depends, grayscale changed nothing for me, I barely noticed the difference.

Or you're talking about literal black-and-white, as in 2 colors no grey?

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