The problem of invisibility, the incredible deficit of self- esteem that full-time mothers describe, seems to come with the territory. Day in and day out, the feedback from their spouse and kids suggests they are part of the woodwork, with no intelligence to illuminate a homework question or share any insights on politics. . . . When no one recognizes or applauds their amazing juggling act, they perforce derive their sense of self-worth from being ringmaster—someone not necessarily talented but indisputably in charge.