When I was young I often wondered why mirrors seemed to flip left and right but not up and down. As I would move my right hand, the mirror depicted my left hand moving. How could this be? In many cultures mirrors take on mythic proportions. Carlos Castaneda has written about the Toltec tradition of holding a mirror in a shallow stream to open a portal into another realm. Judaism adherents cover mirrors during shiva to deter idol worship and honor the memory of the recently departed.