The end of the eighteenth century saw the start of a new craze in Europe: tiny portraits of single eyes that were exchanged by lovers or family members. Worn as brooches or pendants, these minuscule eyes served the same emotional need as more conventional mementoes, such as lockets containing a coil of a loved one's hair. The fashion lasted only a few decades, and by the early 1800s eye miniatures had faded into oblivion. Unearthing these portraits...