There’s a growing movement on turning phone screens to greyscale in an effort to break smartphone addiction.
Companies use colors to encourage subconscious decisions, Mr. Ramsoy said. (So that, for example, I may want to open email, but I’ll end up on Instagram, having seen its colorful button.) Making the phone gray eliminates that manipulation. Mr. Ramsoy said it reintroduces “controlled attention.”
Contrast this to the paragraph in Oliver Sacks’ The Island of the Colourblind, which I just finished, of how people with colour vision deficiency construct an immense mental catalogue of colour definitions.