Two parts, several roles
Sori Yanagi’s Butterfly Stool is made from two curved wooden sections, each forming one leg and half of the seat. The Metropolitan Museum’s example was manufactured by Tendo and combines rosewood with metal fittings.
Holding the form together
A metal rod between the legs holds the assembly together. The design therefore depends on the relationship between the paired wooden forms and a much smaller connecting element. Its wing-like silhouette is also a description of how the seat rises from its supports.
What to examine
Compare a front view with a side view and trace where each half changes from leg to seat. Then locate the connecting rod. This turns an immediately recognizable outline into a question about construction. The stool is worth studying for the way a small number of parts take on several roles, rather than for a broad claim that it represents an entire national design tradition.