In the mid-seventeenth century, the idea of constructing a universal language attracted wide-spread and sometimes frenzied interest. But unlike tulip mania, the quest for a universal language was not simply a fashionable vogue but was firmly grounded in mainstream philosophy and science. This website aims to give a hands-on introduction to one of the more elegant of these schemes, and to provide the background needed to understand why leading scholars of the day thought the project was so important.