Shivji is infinite and yet so simple, that he is represented by the simplest stone.

Lord Shiva shivlinga darshan. Shivji is infinite and yet so simple, that he is represented by the simplest stone. 
Of course! because nothing can exist without His presence in It! 
Not even a stone! stones also vibrate with His name. 
As any mystic will tell you, stones also chant Namah Shivaya in their own way! Aum Namah Shivaya! Jai Ho shivling darshan ! Jai ho Bhakti Bhava!
(shail gulhati)