There is some confusion on the meaning of Runkuracay and translations include egg-shaped building, basket building and sphere-shaped building.
The shape is unusual for an Inca compound. Two concentric walls enclose curved chambers and a courtyard. Runkuracay looks out over the valley below. It has inclined walls that are built to withstand earthquakes.
It would have had a thatched roof, but now it stood in a grand circle, with open passageways pointing, like the Coricancha sun temple in Cuzco, towards all the different paths of the empire.