While it is difficult to see fine details in the image, there are decorative elements that can be analyzed.
The top and base each have repeated elements. The top has two levels, each with 3 panels. The base has its feet and balusters. These are repeated enough times to form patterns.
The middle section has a pattern running down each side.
Over all, these patterns with their vertical lines, tend to accentuate the up and down, helping convey a notion of the container bridging that which is low to those of a higher realm.
The delicate patterns on the side of the middle piece help frame the more complex relief of the inner portion. The pattern prevents other visual elements, outside of the container, to intrude on the inner relief. This allows one to see the relief easier, as well as makes the conceptual statement that the relief should be considered by itself. It also brings a bit of vibrancy, associated with power, to the piece.
On the base, the balusters also create a pattern that contributes to vibrancy . They also are heavier visually, helping relate the heavier lower base with the more delicate middle.
The lower base, with its few simple elements, are too few for an effect of vibrancy, but instead convey stability. Conceptually this simple pattern gives a firm foundation to the container, associating it with the earth, and allowing the more busy patterns above to grow from it.
The top, in some ways, is also of a more simple pattern. Perhaps it is to stabilize the top within the upper realm. Perhaps it is to contrast with the middle portion which actually holds the prayers, which should be considered more important.
Patterns are a good way to cover a form, allowing crafts people to quickly cover an object, in order to provide interest, and hide mistakes. They also hold value on a conceptual level, allowing this container to express the importance of its contents.
