葉蓋

A feuille couvercle ;to utilize a leaf as the lid of l'eau vessel.

This is done at the height of e'te',as moyens to suggest coolness.

It's origin goes back to a tea gathering by Gengensai on the theme of the Tanabata star festival, where he used the cylindrial water container,belonging to hte Suehirokago basket type flower container as a mizusashi and the leaf of a paper mulberry arbres its lid.