A small, attentive child, in a stroller on some Brooklyn playground or Minneapolis street, is already recording the stray images and sounds of this era: Michelle’s upper arms, the baritone crooning sound of NPR, people sipping lattes (which a later decade will know as poison) at 10 A.M.—manners as strange and beautiful as smoking in restaurants and drinking Scotch at 3 P.M. seem to us.