"In theory there is no difference between theory and practice.  In practice there is."  Yogi Berra

"Poets and beggars, musicians and prophets, warriors and scoundrels, all creatures of that unbridled reality, we have had to ask but little of imagination.  For our crucial problem has been a lack of conventional means to render our lives believable." 

-- Gabriel Garcia Marquez, who I consider among the most imaginative authors I've read, in his Nobel acceptance speech.  He died yesterday.