Animals on earth capture light in their own way and see their own colors to suit their lifestyles. The worlds of colors seen by humans, dogs, birds, fish, etc. are different, and there is no difference. And humans are rare creatures that coexist in different colors within the same species. It has become clear that the "congenital color blindness" that was once regarded as "color blindness" is not an "abnormality" but an irreplaceable one that has been cultivated in evolution. Think about how you can understand each other and "enjoy the difference" about the mysterious sensation of color.