The concept of clearing one's mind before performing a task so that it is consumed by nothing but that task, yet is open at the same time to anything that might happen - that concept can be applied to playing guitar, and it's enormously helpful for improvising.
When I see my kids totally into their Legos, it brings me back to the days I was hanging out and playing with my monster models. It brings me there in a second.
I feel really fortunate that, in playing guitar and surfing, I've found two things that mean so much to me, and which really complement each other. There's definitely a spiritual thing to both of them; they totally connect you to a higher realm.