Everyone admits that love is wonderful and necessary, yet no one agrees on just what it is.

As people flock to urban centers where ground space is limited, cities with green walls and roofs and skyscraper farms offer improved health and well-being, renewable resources, reliable food supply, and relief to the environment.

Success produces success, just as money produces money.

Ecstasy is what everyone craves - not love or sex, but a hot-blooded, soaring intensity, in which being alive is a joy and a thrill. That enravishment doesn't give meaning to life, and yet without it life seems meaningless.

In Manhattan last month I heard a woman borrowing the jargon of junkies to say to another, 'Want to do some chocolate?'

Couples are jigsaw puzzles that hang together by touching in just enough points. They're never total fits or misfits. In time, a pair invents its own commonwealth, complete with anthems, rituals, and lingos-a cult of two with fallible gods.

It's so acceptably easy for a woman not to strive too hard, not to be too adventure-crazed, not to take too many risks, not to enjoy sex with full candor ... It isn't seemly for a woman to have that much zest.