Songlines is based upon a pen-drawn script drawn by Michael Harvey to illustrate a poem by Johannes Thurman. The expressive and rough-edged letterforms of Songlines do not have any lowercase characters. Instead, alternative uppercase characters occupy their positions. By using a mixture of upper-case and lowercase characters, text can be given a very lively and vigorous character. For example, the two versions of L are designed to overlap and interact whichever way round they are used. The augmented Songlines Plus version, has many alternative characters and ligatures added together with Opentype features to enable their automatic substitution where the application in which they are used permits.