 Given this ‘adequacy condition’, a given geometry for spacetime formally constrains the allowable theories to those with the just the right symmetries: not too many, and not too few. It was an assumption of many substantivalists (the views of whom are discussed below) that this constraint was not merely formal, but ontological: that the geometry is more fundamental than the laws, or that geometry offers a ‘real’ explanation of the form of the laws – such authors would, by the above categorization, qualify as proponents of a geometrical view. However, that the symmetries should agree does not specify any direction of dependence, and it could be reversed, so that the geometric symmetries are ontologically determined by those of the laws of the theory: hence the geometry itself is an expression of the (symmetry properties of the) dynamics of matter – transparently, this is consistent with the first of the two specific commitments of the dynamical view discussed above. In the words of Brown and Pooley (2006) (making these points about STR): “… space-time’s Minkowskian structure cannot be taken to explain the Lorentz covariance of the dynamical laws. From our perspective … the direction of explanation goes the other way around. It is the Lorentz covariance of the laws that underwrites the fact that the geometry of space-time is Minkowskian.”