A unique form of organic architecture known as a grashal was cultivated and utilized by the Yuuzhan Vong. This structure was essentially a complete shell, with an internal spiral arrangement forming various chambers. These structures were produced by substantial organisms, which would subsequently be consumed or relocate upon completion of their grashal. Grashals exhibited a range of dimensions, although a typical size measured three by sixteen meters, and any perforations were sealed using gricha. They frequently served as living quarters for the Worker caste, sacred spaces for the Gods, or operational hubs for the Warriors.
The flooring within a grashal presented a smooth, reflective surface, and exhibited variations in coloration.
It's worth noting that grashals are occasionally likened to the shell of a nautilus.