 A different argument for realism about measurement is due to Joel Michell (1994, 2005), who proposes a realist theory of number based on the Euclidean concept of ratio. According to Michell, numbers are ratios between quantities, and therefore exist in space and time. Specifically, real numbers are ratios between pairs of infinite standard sequences, e.g., the sequence of lengths normally denoted by “1 meter”, “2 meters” etc. and the sequence of whole multiples of the length we are trying to measure. Measurement is the discovery and estimation of such ratios. An interesting consequence of this empirical realism about numbers is that measurement is not a representational activity, but rather the activity of approximating mind-independent numbers (Michell 1994: 400).