

It taught me that cyan, magenta, and yellow were the primary colors and not red, yellow ,and blue because cyan, magenta, and yellow mixed made black better than the original primary colors.
Most people think that colors are tangible substances but really they are wavelengths of light reflecting into our eyes. For example, my green IKEA couch only reflects green light into our eyes. But if all of a sudden blue light reflected off of it then it would be a blue IKEA couch (and maybe the IKEA company wouldn't recognize it).
P.S. Today is my 124 month birthday!