"Copernicanism and other essential ingredients of modern science survived only because reason was frequently overruled in their past."

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Each album has a different atmosphere. The third album and Houses of the Holy seem to be the two albums that people didn't get off on quite as strongly as the other ones. But I think they contain the basic ingredients for the further pursuance of what we're doing... the turning point to relieve the tedium of repetition.

— Robert Plant