The emergent pattern as it is the most observable and basically requires less investigation. Going back to the water example, it is easier to determine the fact that water is wet (emergent property determined by touching water) than determining the chemical structure of water (fundamental property determined by chemical tests for hydrogen, and oxygen, vaporization, or spectroscopy). Only once we determine the initial state (water is made of particles), only then we can determine the rules (ie. how the molecules interact). Again, going back to the car example, it is far easier to see the propagation of the wave than to determine the structure, engine and system of a car.