  Relational configurations are defined by the relationships between systems.
Individualist configurations are defined by the properties of individual
systems. Non-embeddable relational configurations are those for which there is
no equivalent individualist description. We suggest that situations in physics
where a spacetime description breaks down may be the result of trying to use
individualist configurations to model non-embeddible relational configurations.
We propose a particular example of a relational configuration space, the 2
instant relation (2IR), whose embeddible configurations describe particle
worldlines in a background spacetime. We investigate the properties of these
configurations.
