If you look at my phone, there is not much colour; my screens are not colourful. I use the built-in colour filter to block about 80% of colour, leaving 20%. Why? Then I see you more vividly and the screen is more boring — the screen emits light; your face reflects light. In that situation, competing for attention with the screen — especially today’s Retina displays — you lose; you notice the person on the screen before the person outside it.