ABSTRACT
Humanity has always had an ambivalent attitude to mobility. On the one hand, there is the 'Grand Tour' syndrome - perhaps best summarized by the aphorism 'travel broadens the mind'. From this perspective, to be able to be mobile is one of the most fundamental of human freedoms, set against the tyrannical fixation of slavery or feudalism. Under such systems, people might live their entire lives never venturing more than a few kilometres from where they were born.
