Who has heard of the “green-eyed monster”?

Many predators can have green eyes: wolves, foxes, dogs, cats, among others. Those glow-in-the-dark, green eyes can chill us to the bone if we encounter them in the dark. And they should. They are probably contemplating what you’ll taste like for dinner.

Narcissists think along similar lines. Give them your heart, and they’ll snack on you without batting an eyelash.

But the phrase “green-eyed monster” actually comes from Shakespeare![1]In his plays, Shakespeare uses the phrase to warn of the dangers and power of envy and jealousy to ruin relationships.

In the Renaissance period, artists, particularly painters, began to depict emotions and virtues of their subjects by employing various colors. For example, yellow tended to exhibit someone with …