Many of the models Gaudi built were built upside-down, using a catenary system to determine how the structure would support its own weight. The St. Louis Gateway Arch is a catenary curve. This model hangs from the ceiling, but is reflected in a mirror below.

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Attention new and "digest" subscribers: http://abdownload.free.fr/ is the Anaglyphs archive link that includes the photos as well.

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