We have an unconscious understanding of the meaning of different physical objects through our extensive interactions with them. Designers can extend and adapt the existing symbolic meanings through the design of these objects, adding a layer of emotive expression by manipulating their forms. Tactile Allegory explores the physical design language encoded into objects and asks: how can objects be computationally designed to communicate specific information through their very forms? This research explores the underlying design "grammar" of the form of objects, particularly how objects can communicate information to us through their form. This framework is used to create a computational design tool to help people design expressively shaped objects that can express higher-level sentiments of their ideas via aesthetic forms.