I just wonder what he is thinking about when he is pensive like this. Some fantastic make-believe world is most likely brewing in his head as he is staring at his favorite toy of the moment- Dad's train from when he was child. For more on this, see the post "Trains" on my parenting blog at  http://www.JoyfulParent.blogspot.com. By the way, I guess everyone can tell that I discovered Flickr! What a joy to upload photos through their service.  I had tried Hello and Picassa through Google but I found them difficult to decipher.  I am figuring these things out as I go along but it is more fun everyday!