The archaeological record is filled with hidden messages from the past. Often, these secret texts hide in plain sight. They are buried under monuments and secreted away in machinery. Many times, they exist concealed in later works, remaining only as traces invisible to the naked eye. Modern technology like X-rays, CT scans, multispectral imaging, and robots are bringing these long-lost works to light. 10 Codex Selden For decades, researchers were convinced that the Codex Selden contained hidden messages beneath its surface. Lost for nearly 500 years under a layer of gypsum and chalk, this precolonial Mexican manuscript is made of leather strips covered with a gesso, a plaster-like material. In ...
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