To gain registration in the Principal Register or common law protection under the Lanham Act, a trade dress must not be “functional.” That is, the configuration of shapes, designs, colors, or materials that make up the trade dress in question must not serve a utility or function outside of creating recognition in the consumer's mind. For example, even though consumers associated a distinct spring design for wind resistant road signs with a particular company, the spring design was not protectable for trade dress purposes because the springs served the function of withstanding heavy wind conditions.