The trailer is small and cannot hold a large Christmas tree, so Lisa gets a small one and puts it on this stand with a model train circling it. The track is powered and the train does run, although the curves are very tight.
Here's a close-up of Kuma Bear looking intently at the Santa Fe train circling the tree. He's wearing the socks that Lisa got him for Christmas. Yes, that's an L.A.con IV t-shirt, too, although the con did not make them in that size, so Lisa had to improvise with a tiny shirt and iron-on transfer paper.
Lisa looked at the earlier photos and said that it wasn't obvious what the decorations other than the lights were in the tree, so she took this close-up to show that this all-purpose multi-cultural