18 by 24 inch poster of Vasu Shastra relating to Ayurveda and vastu. Vastu shastra (vāstu śāstra) is an ancient science of architecture and construction. The designs are intended to integrate architecture with nature, the relative functions of various parts of the structure, and ancient beliefs utilizing geometric patterns (yantra), symmetry and directional alignments. (From Wikipedia). The structure is also seen as a macrocosm of a human body and all of its parts relate to the directions and zones of the house or building.