When proof is optional, the rules are too. Here's a list of methods for achieving monochromatic bliss:
Burn all your favorite foods, like pizza and ice cream, in a single color: Burnt orange.
Example: Food on Fire
No more nuance, no more subtlety. Red, blue, and yellow are the only colors you need.
Example: Limited Palette
And that's not all! There are many more monochromatic methods to explore.