A simple 点前 combining 卯の花 and 雪. 淡々斎 created it and 鵬雲斎 performed it on an air carrier in WWII for the 神風 pilots. It's documented in CQ37 和敬 .
It is probably the most rustic of all the 茶箱; but it has some details that make it a bit more elegant than 卯の花. Since it uses two 茶碗, though, it also has a dash of 御所籠 in it!
Focal points, I think, are the first purifying of the lid; scooping of the tea and the return of the 振出.