The world is full of colors. Almost all of them can be described by a wavelength of visible light, but there are some colors out there that are just in your head!
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Sources:
https://faculty.washington.edu/chudler/retina.html
http://hyperphysics.phy-astr.gsu.edu/hbase/vision/addcol.html#c1
https://wtamu.edu/~cbaird/sq/2015/01/22/why-are-red-yellow-and-blue-the-primary-colors-in-painting-but-computer-screens-use-red-green-and-blue/
https://faculty.washington.edu/chudler/eyecol.html
https://askabiologist.asu.edu/rods-and-cones
https://ux1.eiu.edu/~cfadd/1160/Ch23RR/Sub.html
https://www.chem.purdue.edu/gchelp/cchem/RGBColors/body_rgbcolors.html
https://www.compredia.eu/what-does-cmyk-stand-for.html
https://imagine.gsfc.nasa.gov/science/toolbox/emspectrum2.html
https://imagine.gsfc.nasa.gov/resources/dict_qz.html#visible
http://hyperphysics.phy-astr.gsu.edu/hbase/vision/colper.html
https://web.pa.msu.edu/courses/2000fall/phy232/lectures/emwaves/visible.html
http://www.futura-sciences.us/dico/d/physics-non-spectral-colour-50003855/
Images:
https://commons.wikimedia.org/wiki/File:Cone-fundamentals-with-srgb-spectrum.svg
https://commons.wikimedia.org/wiki/File:Linear_visible_spectrum.svg
https://commons.wikimedia.org/wiki/File:Reef0484.jpg
https://www.istockphoto.com/photo/red-huckleberry-and-pine-trees-in-front-of-dewey-lake-gm1148248291-310040328
https://www.istockphoto.com/vector/close-up-on-white-paper-texture-vector-background-gm1171016310-324259394
https://www.istockphoto.com/vector/comic-book-style-crowd-in-fear-gm452144857-25699664
https://www.istockphoto.com/vector/eye-anatomy-rod-cells-and-cone-cells-gm1091261988-292749170
https://www.istockphoto.com/photo/red-apple-gm184276818-17092601
https://www.istockphoto.com/photo/sandy-beach-and-clouds-sky-background-gm1098164024-294922487
https://www.istockphoto.com/photo/fresh-yellow-roses-bouquet-flower-background-gm1136305340-302577532
https://www.istockphoto.com/photo/gerbera-isolated-against-white-background-gm1093549186-293467891
https://www.istockphoto.com/photo/unrecognizable-sportswoman-with-backpack-going-to-the-gym-gm1194656707-340255636
