Sometimes it takes a lot of time and resources to demonstrate something, and sometimes only a few props are enough. Physicsfun shared a short video which demonstrates exactly how CMYK works using only four acrylic coasters and a famous painting.
Roy G Biv–quick show of hands if you’re familiar with the term. Even if it doesn’t ring a bell at first glance, once you realize you’re looking at a mnemonic and not some random guy’s name, it starts getting a little more obvious: Red, Orange, Yellow, Green, Blue, Indigo, and Violet. Yes, those are the colors of the rainbow, but more importantly they’re also the referred to as the visible electromagnetic spectrum.