Strange Code

9PIET

Piet (pronounced “Pete”) is a visual esolang. It’s a perfect example of what an esolang aims to be: a novel way to embody the process of coding. Piet programs are executable pictures. The language is named after Dutch artist Piet Mondrian (1872–1944) because Piet programs often appear similar to his abstract, rectangular paintings. In Piet, art meets code. People talk about elegance in source code, and Piet takes this idea to an entirely new level.

Piet is a stack-based language with a minimal instruction set. In Piet, blocks of the same color represent positive integers, and transitions from one color to another specify the executed instruction. ...