 Nevertheless, equipped with this three-fold distinction for binary distinction we can now appreciate the significance of one contemporary debate about relations. Our ordinary and scientific views of the world are replete with descriptions of things that are non-symmetrically or asymmetrically related. For this reason, Russell advocating admitting both non-symmetric and asymmetric relations alongside symmetric ones (Russell 1903: §§212–6, 1914: 58–9, 1924: 339). But, more recently, it has been questioned whether it is necessary to admit non-symmetric and asymmetric relations at all, i.e., it has been argued that the world contains only symmetric relations by Armstrong 1997: 143–4; Dorr 2004: 180–7; Simons 2010: 207–1, but for counter-arguments see MacBride 2015: 178–94.