Gibson Dusk Tiger
Originally uploaded by mikemilton
In this shot the guitar initially tunes to standard tuning, which it does by default each time it is turned on (and, yes, one can just tune manually and play if you wish).
The guitar is then set to an Open tuning and strummed. I like accuracy so I have the guitar set so that it re-tunes to accommodate any neck bending when the tuning change is significant