 The Machian ambitions of Barbour and collaborators do not end there, for these authors also seek to excise primitive temporal structure. Initially, one might distinguish histories that correspond to a single curve in configuration space being traced out at different rates with respect to the primitive temporal parameter. Those working in this tradition, however, view each curve in configuration space as corresponding to exactly one possible history. They therefore elect to dispose of the auxiliary one-dimensional space representing a primitive absolute time which was introduced above. Instead, they seek to construct an ‘emergent’ notion of temporality from dynamics defined on configuration space alone. By way of a procedure known as ‘Jacobi’s principle’, the Machian relationist selects a unique temporal parameter which maximally simplifies this dynamics defined on configuration space. For the details of Jacobi’s principle, see Pooley (2013).