Screens Exploit the Trick

Every screen you own — phone, laptop, TV — relies on the same illusion that creates magenta. Each pixel contains only three sub-pixels: red, green, and blue. By mixing intensities of just these three, screens reproduce millions of perceived hues.

None of those hues are real wavelengths. Your screen never emits yellow light — it fires red and green sub-pixels together, and your brain perceives yellow. It never emits cyan; it mixes blue and green. The whole display industry is built on tricking your visual system into seeing a rich world from just three narrow bands of light.