Full Idea
In metaphysics, space is intrinsically structured; the genuine betweenness and congruence relations are privileged in a way that Euclidean-betweenness and Euclidean-congruence are not.
Gist of Idea
Space has real betweenness and congruence structure (though it is not the Euclidean concepts)
Source
Theodore Sider (Writing the Book of the World [2011], 03.4)
Book Reference
Sider,Theodore: 'Writing the Book of the World' [OUP 2011], p.42
A Reaction
I note that Einstein requires space to be 'curved', which implies that it is a substance with properties.