This quote from Ken Knabb’s

[..] Block clubs, co-ops, switchboards, study groups, alternative schools, free health clinics, community theaters, neighborhood newspapers, public-access radio and television stations and many other kinds of alternative institutions are worthwhile for their own sake, and if they are sufficiently participatory they may lead to broader movements. Even if they don’t last very long, they provide a temporary terrain for radical experimentation.But always within limits. Capitalism was able to develop gradually within feudal society, so that by the time the capitalist revolution cast off the last vestiges of feudalism, most of the mechanisms of the new bourgeois order were already firmly in place. An anticapitalist revolution, in contrast, cannot really build its new society “within the shell of the old.” Capitalism is far more flexible and all-pervading than was feudalism, and tends to coopt any oppositional organization.Nineteenth-century radical theorists could still see enough surviving remnants of traditional communal forms to suppose that, once the overarching exploitive structure was eliminated, they might be revived and expanded to form the foundation of a new society. But the global penetration of spectacular capitalism in the present century has destroyed virtually all forms of popular control and direct human interaction. Even the more modern efforts of the sixties counterculture have long been integrated into the system. Co-ops, crafts, organic farming and other marginal enterprises may produce better quality goods under better working conditions, but those goods still have to function as commodities on the market. The few successful ventures tend to evolve into ordinary businesses, with the founding members gradually assuming an ownership or managerial role over the newer workers and dealing with all sorts of routine commercial and bureaucratic matters that have nothing to do with “preparing the ground for a new society.”[…]Meanwhile, until a revolutionary situation enables us to be truly constructive, the best we can do is be creatively negative — concentrating on critical clarification, leaving people to pursue whatever positive projects may appeal to them but without the illusion that a new society is being “built” by the gradual accumulation of such projects.[…]The best projects are those that are worthwhile for their own sake while simultaneously containing an implicit challenge to some fundamental aspect of the system; projects that enable people to participate in significant issues according to their own degree of interest, while tending to open the way to more radical possibilities.