Stack Trace Art is, in its essence, the art of throwing an exception that creates a beautiful drawing on the caller’s stack trace.
By Igor Rončević, from Stack Trace Art intro blog post
If you want to understand what this is, read the above post first. It's a wonderfully written story about how an idea about making art via throwing an exception came to be. Then read about how it works: His Majesty, Hangul the Filler
This work is MIT licensed.