“The human eye is packed with millions of cone-shaped cells that allow for color to be perceived. For those with normal vision, the three types of cones allow vision of about one million distinctive colors,” notes IFL Science. “Some animal species including certain birds, insects, fish, and reptiles, have a fourth type of cone cell that extends color perception into the UV range. Though evolution has mostly scrubbed that fourth cone from the mammalian lineage, there is evidence that a small group of humans may have a genetic variant that allows for tetrachromacy. Concetta Antico, an Australian artist [one of her landscapes to the right] , was confirmed to be a tetrachromat in 2012.” Read more.