 Some may question how the laws can be such as to privilege frames without prior spacetime geometry. In reply, Huggett 2006 proposes that the laws be understood as a Humean ‘best system’ (see the entry on  laws of nature)  for a world of bodies and their relations; the laws don’t reflect prior geometric structure, but systematic regularities in patterns of relative motions. For obvious reasons, this proposal is called ‘regularity relationism’. (Several authors have developed a similar approach to a variety of physical theories: for instance, Vassallo &amp; Esfeld 2016.) This approach is committed to the idea that in some sense Newton’s laws are capable of explaining all the phenomena without recourse to spacetime geometry; that the connection and the metrical properties are explanatorily redundant. This idea is also at the core of the ‘Dynamical Approach’, discussed in the companion article.