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"It sort of dramatised a lot of the public's fears about the counter-culture, the alternative society," says Phil Cohen, now an emeritus professor at East London University but then the squatters' leader and known as "Dr John".

"Hippies never referred to themselves by the name but as 'freaks' or as members of the alternative society."

His vocabulary combines ballet, modern and various aspects of modern social dance in a clever fusion; his structures, like those of “The Catherine Wheel,” suggest a positively alternative society.

These habitats nicely matched the sense that the fairies were a complete alternative society, at once invisible and very close to you … their presence and their movements were superimposed across the world above ground, in the form of fairy trees and fairy paths.

Marr has said the album explores an “alternative society” set in the “not-too-distant future” but it turns out to be a very loose concept.