In the Kanshitsu technique, natural Urushi lacquer is fundamentally mixed with clay (polishing powder) , which is then applied to hemp cloth to form the sculpture. 
It is essentially lacquer-based "papier-mâché".
The fundamental method remains unchanged from how Buddhist statues were made in the Nara period.
Lacquer hardens in a humid environment (temperature: approx. 15–25°C / humidity approx. 75%).
Once hardened, it becomes resistant to acids, alkalis, heat, and water, enduring even after 3,000 years.
However, like us, it is vulnerable to ultraviolet light.
Urushi is collected by wounding the Urushi Tree, but only a few drops can be gathered at a time.
Sculptures shaped by gathering these drops one by one are crystallizations of lacquer tears.
They emerge as the tree tries to seal its wounds. 

We are the ones receiving them.

It is truly a gift received from Urushi.