Full Moon, choreographed by Cheng Tsung-lung, Ocho, choreographed by Rafael Bonachela. Sydney Dance Company, Roslyn Packer Theatre Walsh Bay, May 1. At first glance the two works in Sydney Dance Company’s Orb look quite different but they are close kin under the skin and together make an exceptionally absorbing double bill. Cheng Tsung-lung, who choreographed…