But they can’t be clear because we need their rosy tint to motivate us to design the helicopters (“I’m sure this thing will fly”), plant the corn (“This year will be a banner crop”), and tolerate the babies (“What a bundle of joy!”). We cannot do without reality and we cannot do without illusion. Each serves a purpose, each imposes a limit on the influence of the other, and our experience of the world is the artful compromise that these tough competitors negotiate.