What Color is Your Function? (2015)

This article uses a fictional programming language with "colored" functions (red and blue) to illustrate a concept about function design and compatibility constraints. The author demonstrates how higher-order functions are useful in practice, but introduces rules where functions must be consistently colored and called using matching syntax, making it impossible to use functions interchangeably. The piece appears to be a satirical critique of programming languages that create similar artificial restrictions that limit code reusability and flexibility.