Which Came First?

Which came first--art or architecture? It could be argued that first was architecture, a place to live, a place for protection, a home where within one could hang artworks. Yet paintings were found within the Palaeolithic caves of Lasqaux long before man desired architectural design. The prehistoric paintings present a reverse argument that art preceded architecture. Natural caverns in the earth surely can not be considered architecture. Shelter, yes, but not architecture.