Google Escher Effect - Paris, France
Stitching together satellite pix and aero pics of cities can result in situations like this where the different aerial vantage points result in buildings' pictures being taken at different angles. Once stitched together, the taller buildings at the edges of each of the pictures appear to be leaning toward or away from one another at pronounced angles.
This has come to be known as the "Escher Effect", named after M.C. Escher, an artist who made pictures sometimes with optical illusions inspired by contradictions in perspective. Escher's illustrations of structures with impossible angles had the exact same "feel" as the image above, and his topsy-turvey pictures are widely known.
Check out more of my Satellite Escher Effect pictures.
UPDATE 4/18/2010: Google Maps Has Fixed The Escher Effect.