With apologies to Robert Pirsig:

Is it a language, or an operating system, or a virtual machine? Mu.

For an earlier prototype, a high-level statement-oriented language with a tree-walking interpreter, see mu1.

The zen of Mu:

traces, not interfaces

be rewrite-friendly, not backwards-compatible

be easy to port rather than portable

global structure matters more than local hygiene

Mu's vision of utopia: