 Such issues lend weight to a second strain of interpretation (see Long 1974, Bollack 1965–1969), which still reads the fundamental principle of B 17 (= D 73) as referring to alternating periods of domination by Love and Strife. However, they hold that there is only one cosmogony and one zoogony. In the vortex, Strife dominates in order to separate the roots into their respective places, shattering Love’s Sphere. Strife’s creation of separate elements allows for their recombination by Love to form a cosmos. As described above, this would be a condition in which some portions of each of the other roots become intermingled. Love asserts her influence, forming the cosmos (consisting of a world-order with continental land-masses, oceans, rivers, winds, sun, moon, seasons, planets, stars, etc.). From the mixture of roots in due proportions, there arise various forms of animal life. Ultimately, both animals and cosmos perish as Love totally reunifies the roots. Thus, finally, the Sphere is restored and the cosmos ends. On this interpretation there is a single cosmogony generated by the increasing power of Love and a single zoogony under alternating dominance by Love and Strife. The idea of a single cosmogony and zoogony is attractive, in part, because it echoes other Presocratic philosophers.