This is because man contains within himself cosmic forces that transcend his physical body. His varied parts and limbs, elements of a higher image, the Tzelem Elokim, are human manifestations symbolic of a larger dimension, the primordial man who encompasses all creation. This conception of human life binds man to his Creator, and he shoulders the responsibility to reflect the thirteen characteristics of his Maker. The deeds of man affect more than his immediate environment. If he wishes, man can reach the heavens, the perfect man reflecting the G-dly image that is the essence of his being.
Man is more than a mere body.
His physical form is the casing of a spiritual dimension in which he connects the material world to its Heavenly core. The Mishkan, and subsequently, the Bais HaMikdash, is a third element that parallels man and creation. It too, is a microcosm of the universe, every room and chamber alluding to a specific limb or dimension. It is for this reason that the Holy of Holies is located at the center of existence, the Even HaShesiyah that is the bedrock of creation. The Temple is the fulcrum upon which all the world revolves, and the Kodesh HaKodashim at its heart pumps life to all existence.