Have you ever seen the optical illusion that suddenly brings a black and white image into full color using just the power of your eyes? It’s a thing called “after-imaging” and you can see it in the video below, all beautifully explained by the guys from AsapSCIENCE.
It's all to do with the three color-sensing cone cells in the retina of the eye, each of which is sensitive to different wavelengths of light: blue, green, and red. However, these cells can pick up 2.3 million different combinations of them – a little bit like printer inks. But just like printers, when colors start to “run out”, there can be some adverse effects.
There’s a huge amount of science behind our relationship with color and vision, bringing in everything from physics, biochemistry, and evolutionary biology – and optical illusions are a great way to demonstrate it. Check out the video to hear all about it.