Three Books... Why three? We live in a three-dimensional world, colored with hues that break down into a trio of primary colors. Our souls (according to Plato) and our psyches (according to Freud) are trilithic. Three is a number that allows for conversation, completion, understanding. And so "Three Books..." invites writers to recommend three great reads on a single theme.

The Krasnaya Polyana mountain range, viewed from the Olympic host city of Sochi, shows off the stunning landscape of southern Russia. Richard Heathcote/Getty Images hide caption

toggle caption
Richard Heathcote/Getty Images