Silly bird...

We have a strange phenomenon occurring here again this spring. A bluebird flies around and straight into our sunroom windows. It flutters around from window to window. This has happened the past 4 springs. Here is what we think is happening. What do you think?

In June 2004, we moved 3 trees in preparation for adding onto the house. This evergreen was on the west side of the house, which you can see on the far left of the pic.
In this pic, this evergreen was in the hole kind of in the center of the picture. Look at the roofline...it will be referred to later.
Here is the addition built in the summer of 2004. Can you identify the previous west side of the house? Find the wood stove chimney. The horizontal roofline is over the library addition, and then the sunroom is to the west (left) of that. The upper windows of the sunroom is where this silly bird flies around. We think it is looking for the tree we moved. It hasn't figured out where we moved it to. What can we do? The poor thing can't build a nest. Oh, the trials, oh, the confusion...