Remember that mood lipstick from the '80s that changed color depending on your body chemistry? Over the past few months I've noticed that a similar-sounding technology is popping up in a lot of high-end lip glosses, all of which purport to turn the "right" shade for your skin tone. I've recently seen a bunch of readers talking about their experiences with them over on the Product Reviews pages, from Smashbox O-Gloss ($22) to Dior Addict Lip Glow ($28). I'm curious about this trend, and I'd love to hear what you all think. Do you believe that your body chemistry can really give you the right lip shade? And if you do, have you tried one of these glosses? How'd it work?