The Distracted Mind
In defense of the wandering mind, a lot of my best solutions have come to mind while on a walk or in the shower. Doing something rote and physical when the mind may wander (which is perhaps happening all the time, but at a level below consciousness) is the ideal situation for the good idea to trickle up into recognition.
I've also spent significant chunks of my life as a bureaucrat and an ersatz rock star. Yes, absolutely, when buried deep in reconciling someone's credit card expense report, those thoughts about playing guitar have been an indicator that at that moment I wanted to be doing something else.
When the work's done, I go and do something else fun.
As I think about it, there's been a time or two when I've been playing music and thought about something at the day job. I guess the point is that disengagement from the moment happens and it only means that all our concentration is not needed.
Now the occasional moment of disengagement is a first step to being totally disengaged, which is known as alienation and unhappiness, as the occasional adult beverage is necessary to alcoholism. Well, yes, but there's a fairly large gap between those states that most people will not traverse.
I use an iPhone.
And I think.......
I'm thinking about playing Angry Birds.