In his 1938 paper, ‘On progress in geography’ published in the Scottish Geographical Magazine, P.R. Crowe took geographers to task for their ‘overweening concern with the static elements of the Earth's surface. Is progressive geography’, he asked, ‘to be solely concerned with the distribution of Homo dormiens?’ (Crowe 1938: 12). Crowe's plea for a more mobile geography was repeated 27 years later by Peter Haggett in Locational Analysis in Human Geography. Haggett noted that the intervening period had seen ‘a growing recognition of momentum and circulation patterns in geographical research’ such that ‘human population is regarded not as a static feature but as a complex of overlapping particles, with short loops connecting places of sleep, work and recreation, and longer loops connecting old hearths ...