Complementary Afterimage uses multiple fluorescent sticklights to create intense colour blocks flooding the entire space with saturate light. By mixing primary colours red and blue light together, West demonstrates colour mixing in practice as the space is flooded with secondary colour purple. When the human eye focuses for a duration on either of the colour light blocks, as soon as we turn away or close our eyes the complementary colour will be left on our retina as an afterimage.

https://www.liz-west.com/complementary-afterimage (05.10.2021)