Tory David Willetts (apparently 'Shadow Secretary of State for Innovation, Universities and Skills') is to make a speech tonight at the LSE - the Oakeshott lecture indeed - espousing the virtues of reciprocity, community and altruism. He is proposing that institutions be designed to support this sort of thing. The dry stone wall metaphor comes in because, as the Times quotes:

A dry-stone wall, like the one David Willetts pointed out to David Cameron, does not have any glue or cement holding it together. It holds together because of the way it has been designed. Similarly, the aim of Tories is not to pour social glue on civil society through public policy, and armies of new laws, nor is to enunciate some new abstract principle of justice that might be at variance with human nature. It is to help society find different kinds of equilibrium.

Willetts was on radio 4 this morning enthusiastically recounting how game theory, evolutionary economics and neuro-biology are giving scientific weight to his argument: as the lecture website says, he uses 'latest research from these disciplines [or at least popularisers of...] to explain what Government can and cannot do to influence our behaviour.'