Not really. I think the differences in lighting and certain superficial features do it. The black line on the top spine is certainly crooked, but I don't think that's part of the main architecture. Not really. I think the differences in lighting and certain superficial features do it. The black line on the top spine is certainly crooked, but I don't think that's part of the main architecture.I don’t know...it appears the entire spine follows the “black line”.