"Let us agree," Federico Garcia Lorca wrote, "that one of man's most beautiful postures is that of St. Sebastian." "In my 'Saint Sebastian' I remember you," Salvador Dali replied to Garcia Lorca, referring to the essay on aesthetics that Dali had just written, ". . . and sometimes I think he is you. Let's see whether Saint Sebastian turns out to be you." This exchange is but a glimpse into the complex relationship between two...