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The Copiale Cipher is a 105-page, hand-written encrypted manuscript from the mid-eighteenth century. Its code was cracked and the text was deciphered by using modern computational technology combined with philological methods. We describe the book, the features of the text, and give a brief summary of the method by which we deciphered it. Finally, we present the content and the secret society, namely the Oculists, who were hiding behind the cipher. 

Cities are places of ethnic and linguistic diversity, and thus of language contact. This isillustrated by the oasis city-states along the Silk Roads in Central Asia that developed intocosmopolitan centres of an amazing religious, ethnic and linguistic diversity during thefirst millennium AD. The growing trade on the Silk Roads, missionary activities, shiftingpolitical, religious and military domination, and last but not least climatic changes ledto increasing immigration into the cities, creating a multilayered linguistic ecologicalsystem of interacting spoken and written codes. A flourishing written culture developed;and the rich activity of urban cross-cultural exchange is not only reflected in art andarchitecture, but also in a vast variety of texts and manuscripts translated and annotatedin more than twenty different languages and nearly as many different scripts. Traces ofthe cross-cultural contact are also revealed by the individual languages themselves, whichchanged dramatically on many different levels. An ecolinguistic study of Tocharian – oneof the lesser known tongues of the Turfan and Kucha area along the northern route of theSilk Road – taking into account status, internal variation, domains of usage, concurrentcodes and language contact, reveals one aspect of an “urban mind”: namely, the efforts andsuccess of city dwellers to tackle communication in the multilingual settings of the city.In creative processes the speakers in close spatial coexistence changed and adapted theircodes, both the spoken and the written ones, and developed new varieties and registers.Tocharian shows traces of the impact of concurrent codes, not only in the lexicon butalso on the structural, morphological and morphosyntactic level. For reasons yet to beexplored, Tocharian was abandoned as a high-status written code sometime between theeighth and the tenth century AD, and at an unknown point in time it became extinct asa spoken code as well.