Roughly contemporary to Plato, in his descriptive grammar of Sanskrit, Pāṇini constructed a set of rules for explaining language, so that the text of his grammar may be considered a mixture of natural and constructed language. A legend recorded in the seventh-century Irish work Auraicept na n-Éces claims that Fénius Farsaid visited Shinar after the confusion of tongues, and he and his scholars studied the various languages for ten years, taking the best features of each to create "in Bérla tóbaide" ("the selected language"), which he named "Goídelc"—the Irish language. This appears to be the first mention of the concept of a constructed language in literature. The earliest non-natural languages were considered less "constructed" than "super-natural", mystical, or divinely inspired. The Lingua Ignota, recorded in the 12th century by St. Hildegard of Bingen is an example, and apparently the first entirely artificial language. It is a form of private mystical cant (see also language of angels). An important example from Middle-Eastern culture is Balaibalan, invented in the 16th century. Kabbalistic grammatical speculation was directed at recovering the original language spoken by Adam and Eve in Paradise, lost in the confusion of tongues. The first Christian project for an ideal language is outlined in Dante Alighieri's "De vulgari eloquentia", where he searches for the ideal Italian vernacular suited for literature. Ramon Llull's "Ars Magna" was a project of a perfect language with which the infidels could be convinced of the truth of the Christian faith. It was basically an application of combinatorics on a given set of concepts. During the Renaissance, Lullian and Kabbalistic ideas were drawn upon in a magical context, resulting in cryptographic applications. The Voynich manuscript may be an example of this. Renaissance interest in Ancient Egypt, notably the discovery of the "Hieroglyphica" of Horapollo, and first encounters with the Chinese script directed efforts towards a perfect written language. Johannes Trithemius, in "Steganographia" and "Polygraphia", attempted to show how all languages can be reduced to one. In the 17th century, interest in magical languages was continued by the Rosicrucians and Alchemists (like John Dee and his Enochian). Jakob Boehme in 1623 spoke of a "natural language" ("Natursprache") of the senses.