  The carved and painted decorations in traditional Batak houses and buildings,
gorga, are the source of their exoticism. There are no identical patterns of
the ornaments within Batak houses and the drawings are closely related to the
way ancient Batak capture the dynamicity of the growing 'tree of life', one of
central things within their cosmology and mythology. The survey of ornaments of
Batak houses and buildings in Northern Sumatera Indonesia has made us possible
to observe the complex pattern. The fractal dimensions of the geometrical
shapes in gorga are calculated and they are conjectured into 1.5-1.6, between
the dimensional of a line and a plane. The way gorga is drawn is captured by
using some modification to the turtle geometry of L-System model, a popular
model to model the dynamics of growing plants. The result is a proposal to see
Bataknese gorga as one of traditional heritage that may enrich the studies to
the generative art.
