It's not about the perfection of the act or the skill, but the process of doing it, the delight in the physical experience. It's feeling the guitar strings under your fingers, even if you only know two chords. It's the singing, full throttle, in the shower with only the dog to hear you. It's not caring a whit what the guy stuck in traffic next to you thinks of your mad steering-wheel-drumming skills.
It's when we lose ourselves in the movement that we find our tune and the inspiration to play it.