Espeland and Stevens define commensuration as the transformation of different qualities into a common metric, making heterogeneous entities comparable by converting difference into magnitude. Their central intervention is to show that this is never merely a technical operation. Metrics simplify information and enable decisions, but they also suppress dimensions that cannot be translated, reorganise authority and generate new categories that may eventually become constitutive of the realities they measure. The methodological insight is therefore reflexive: comparison requires analysing the work that creates comparability, including exclusions, proxies, institutional routines and political stakes. Their treatment of incommensurability is equally important, because refusal of comparison can itself express moral or cultural value. The essay bridges sociology of quantification, valuation studies and STS, demonstrating that every comparative system is simultaneously an epistemic device and a social arrangement. What becomes comparable is inseparable from who defines the metric and what disappears in translation.
URBANISM MEETS ART