Alone among the artifacts

Since I returned from Anchorage late this morning, I have been alone in this house and office and I will be for the rest of the week, or at least until Thursday evening. About the only way I will interact with other human beings is when I go to breakfast at Abby's and pull up to the Metro Cafe drive-through window or maybe even go inside once or twice.
There are some good things about being alone. I have a huge amount of work to get done, and I won't have any distractions, save for the barriers in my own mind. Once I punch through them, I should really be able to dig into things and get a lot done. All around me, I see plenty of artifacts left behind by those who sometimes share this house with me. Their presence is still here, even though they are elsewhere.
Who do you think this particular artifact reminds me of? Two people, actually. Margie, who sketched the train to serve as a homemade coloring book, and Kalib, who colored it and added the tracks, smoke and grass.