Love.
As Isaac gets older, there are fewer and fewer opportunities when he will really cooperate when I have a camera in hand. The moments when I can actually collaborate on photos with a three and a half year old are priceless. I love the infrequent moments when he not only humors me by standing in front of the camera, but adds to the process.
And, of course, it is gratifying when he wants to hold his camera (a Holga I gave him) while we’re shooting, so he can be like dad.