Sanctity of the Sukkah and the Four Kinds

The mitzvos of Succos, more than other mitzvos, reveal the capacity of physical objects to be used in the performance of a mitzvah; the difference, however, lies in the fact that the sanctity inherent within the Sukkah is directly related to the performance of the mitzvah, while the "Four Kinds" have an inherent nature, which makes them uniquely suited for the performance of the mitzvah.