For me, practice and experiment are the same thing. The great thing about practicing the guitar is that any application of "theory" - and its nexus with the imagination, is followed by a continual rite of passage into practice, performance and change - they become fluid. Practice and theory are loaded words. For many of us there is so much diversity in practice , from the tried and true application of certain principles to get the job done, to the realm (especially in improvised music) where one actually doesnt know whats about to happen next. As I get older I spend much more time in the latter.