The façade--the aspect of a building that both looks at, and is seen from, the street--erects a philosophically and artistically productive ambivalence. Depending on the building's purpose and comportment, the façade may bear little or no resemblance to the structure within. A façade may clearly indicate the purpose of a structure--such as those of government buildings, restaurants, or grocery stores; they may function as merely surface covering--such as the prescribed façades of residential buildings in some historic neighborhoods; or they may be transparent, "invisible," or feigning--such as the façade of a "speak-easy." As a metaphor, the ambivalence erected by the façade seems to extend to numerous aspects of our engagement with the world. Just as the façade both reveals and conceals the depth of the building behind it, so the face we turn towards others both reveals and conceals our feelings, intentions, and character.