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To put it bluntly, for much of this century, developmental psychologists have carried out their research much like the metaphorical goldfish swims around the goldfish bowl, oblivious to the water that sustains both themselves and their subjects. Observable interactions are likely to have unobservable determinants in the histories of individuals. The social world influences the individual not only through the agency of flesh-and-blood people who converse, communicate, model or persuade, but through the social practices and objects unseen people have built up in the world around that individual (White, 1996).