Book excerpt: Besides the efforts that are of a descriptive and celebrative nature, studies related to Sri Lanka's historical built heritage largely view material remains in historical, sociological, socio-historical and semiological perspectives. There is hardly any serious attempt to view such material remains from a technical-analytical approach to understand the compositional aspects of their design. The 5th century AC royal complex at Sigiriya is no exception in this regard. The enormous wealth of information and the material remains unearthed during more than 100 years of field-based research by several generations of archaeologists provide an ideal opportunity for such analysis. The Sigiriya Royal Gardens fills the gap in research related to Sri Lanka's historical built heritage in general, and to Sigiriya in particular. Therefore, the present research attempts to read Sigiriya as a landscape architectonic design to expose its architectonic composition and design instruments.