Software and data are human phenomena (on Earth, at least), but I call them natural phenomena?  Consider Carl Sagan's provocative argument:

> We are a way for the cosmos to know itself.

Sagan implies that humans aren't just inseparable from nature; we *are* nature.  I agree with him.  The distinction between natural and artificial is, for lack of a better term, artificial.  It may be a useful distinction is some contexts, but I think it's simpler and more interesting to put technology (like software and data) on a level playing field with everything else.

Hence, software and data are nature's most interesting systems.