'Change life! 'Change society!' These precepts mean nothing without the production of an appropriate space. … new social relationships call for a new… - Henri Lefebvre

Socialism, when it attempts to predict or imagine the future (which Marx refused to do, since he conceived of a path, not a model), provides us merely with an improved form of labor (salaries and material conditions on the job).

Just as economic pressure from the base … is able to modify the production of surplus value, so pressure grounded in spatial practice is alone capable of modifying the apportionment of that surplus value — i.e. the distribution of the portion of social surplus production allotted to society's collective 'interests', to so-called social services. Such grass-roots pressure, if it is to be effective in this regard, cannot be confined to attacking the state qua guardian of the 'general interest'. For this state, born of the hegemony of a class, has as one of its functions — and a more and more significant function — the organization of space, the regularization of its flows, the control of its networks. It devotes to these purposes a considerable part of global surplus value, of the surplus production assigned to the running of society.

The method of Marx and Engels consists precisely in a search for the link which exists between what men think, desire, say and believe for themselves and what they are, what they do. This link always exists. It can be explored in two directions. On the one hand, the historian or the man of action can proceed from ideas to men, from consciousness to being - i.e. towards practical, everyday reality - bringing the two into confrontation and thereby achieving archieving criticism of ideas by action and realities. That is the direction which Marx and Engels nearly always followed in everything they wrote; and it is the direction which critical and constructive method must follow initially if it is to take a demonstrable shape and achieve results.
But it is equally possible to follow this link in another direction, taking real life as the point of departure in an investigation of how the ideas which express it and the forms of consciousness which reflect it emerge. The link, or rather the network of links between the two poles will prove to be complex. It must be unravelled, the thread must be carefully followed. In this way we can arrive at a criticism of life by ideas which in a sense extends and completes the first procedure.