Recursion definedForget the sound of one hand clapping or a tree falling in an uninhabited forest. This little coder’s mantra is the ultimate Web 2.0 zen koan.

The next time some code-ignorant management type gets all uppity about your mad tech-fu and asks “what makes programmers so special?” counter with this t-shirt, which understates the advanced philosophical concepts that separate the engineers from the end-users. Plus, it serves as a gateway pun for all those closed-source serfs who long to know what’s so funny about the acronym GNU, or why this highly self-referential (on many levels) roleplaying comic is so freakin’ funny.