HOI is the abbreviation of Higher Order Interpolation. By introducing this new perspective for font interpolation we can do things not achievable with traditional linear interpolation. HOI is a simple and “ready-to-use” solution to fully control our manually designed masters and interpolation. HOI is not only expanding the field in which fonts are designed and exist, but also questions some foundations of type design: like the concepts of design-space, masters, locations, and interpolations.