When you look out on the universe at night, it does not seem
like a very symmetrical place.  Everywhere you look, you find
vast empty space punctuated by galaxies of great energy and 
activity.  Certainly this chaotic universe seems very different 
from symmetric objects of our usual experience like crystals
or perfect Euclidean circles.  Yet the universe is full of hidden
symmetry!  In this talk I will discuss these subtle symmetries, 
how they manifest themselves in our everyday experience, and how
an even more subtle type of symmetry unlocks the subatomic world.