Google maps skews Chicago skyline

It appears that some of the satellite images supplied by Digital Globe to Google for their maps of Chicago are actually taken from different angles. When stitched together, this leads to a sort of cubist view of the skyline. In fact, the images are not stitched together along a straight line. I’ve included one of the most prominent examples.

Here is the original scene as displayed by Google earth:

Here is the scene with an imaginary line showing the apparent stitch line: