Sometimes themes just present themselves. A bevy of backs began with an e-mail from the photographer David Schoerner informing me he had recently started working on a series of photographs inspired by the 1988 painting "Betty" by Gerhard Richter. (That's Schoerner above and Richter below.) Then the next thing you know back views are popping up everywhere!
This from Stuart O'Sullivan:
A trio of fashionable backs from The Sartorialist:
A pair of images showing what it takes to work at French Vogue from Tommy Ton of Jak and Jil:
These from Casia Bromberg, an interesting photographer from Sweden:
And lastly, if just the back of a head can count, this old favorite "Lloyd's Head", 1944, by Barbara Morgan: