Form that is not able to be defined as absolutely typographic or pictorial. Temporal type that is medial adheres to formal principles and relies on extended observation in order to be recognized as such.
Typographic form that lasts only for a limited amount of time. The form may appear briefly and then visually or physically disappear, or it may transition from a form that is typographic to something that is not.
Temporal type that is navigable typically appears in a 3D context while 2D form only gives the appearance or illusion that the form is navigable. As the viewpoint or perspective changes, the form also appears to change.