A work of unsurpassed beauty, this elegant box with soft corners and a subtly rounded frame was formed from leather and then coated in thick layers of lacquer. There are minute variations in the shades of gold powder used to depict the lotus flowers and butterflies across its surfaces in maki’e —designs expressed in sprinkled gold or silver powder. One can imagine that the sutra scrolls stored within it were embellished with sublime ornament as well.
 
MIMOTO ShusakuEnglish by Mary Lewine 
Buddhist Art Paradise: Jewels of the Nara National Museum. Nara National Museum, 2021.7, p.346, no.61. 

The structure of this sutra case was made of leather which was then coated with layers of lacquer. The surface of the lid and the four sides of the case are decorated with sprinkled gold dust, and lotus flowers and vines are depicted over it. The reverse side of the lid is decorated with sprinkled gold dust, too, although more sparsely, and butterflies of various poses are described on it. Several kinds of gold dust and aokin (alloy of gold and silver) dust were arranged effectively to illustrate the flowers, vines and butterflies gracefully. The metallic fittings for braids, attached to both sides of the case, are in the shape of hōsōge flowers with four petals. These fittings reflect the delicate sense prevailing at the time when this case was made.
This type of lacquered cases using leather for the case structure was popular during the Nara and the early Heian periods, which is proved by the forty similar objects in the Shōsō-in treasure house and other examples in Tō-ji temple, but the sutra case introduced in this article is probably the single extant example made during the late Heian period. It had originally been kept in Jingū-ji temple in Fukui Prefecture. 
Masterpieces of Nara National Museum. Nara National Museum, 1993, pp.110-111, no.86.