This is interesting because Silverberg upsets current thinking and creates a society based on population proliferation with a result that is outwardly idyllic. His World inside is one devoted to uncontrolled families and to housing developments run wild and stratospheric in proportion. Everyone has access to constant sex and 'nightwalkers' are expected visitors. The novel deals with the few deviants from this structured society, their guilt and exposure, and, against all logical odds, he makes you believe it.