The Colour You Invent

Find something red near you. The red is not in the object. It is not in the light. It is happening, right now, only inside your head.

Light is just waves of different lengths — no colour at all, only measurement. When a long wave lands in your eye, certain cells fire, and your brain paints the sensation you've agreed to call red over the world like a label. The object is throwing back a wavelength; the redness is your own invention, projected outward so convincingly you would swear it was out there.

Then there is magenta. Look at anything pink and you are seeing a colour with no wavelength at all — no such light exists. It belongs between red and violet, which sit at opposite ends of the spectrum and never overlap. Your brain, handed both ends at once and refusing to show you a gap, simply fabricates a colour to bridge them. Magenta is a guess. A rumour your eyes tell themselves.

Every colour you have ever seen was assembled behind your eyes, in the dark, and hung over a world that has none.

So what else is your brain showing you that was never really there?