In Taiwan, a design must be "original" to be patentable. Since a design that simulates a known object is not original as required by the Patent Law, a "test for originality" will be applied in determining the patentability of a design over a piece of prior art. According to the Examination Guidelines published by Taiwan's IP Office, to determine whether two designs are similar, the designs shall be viewed from the naked eyes of ordinary consumers without the aid of any instrument. Moreover, as a design patent in Taiwan protects only the visually appreciable appearance of an article of manufacture, the mechanical function and construction of the article, as well as the operation processes involved in the use of the article are all excluded from design patent protection.