A Japanese tanka (or waka) is a poem composed of thirtyone syllables in two sections: kami-ku and shimo-ku. The three lines of kami-ku comprise five, seven, and five spoken syllables respectively. Each of the two lines of shimo-ku comprises seven spoken syllables. (The "recent" Japanese short poem haiku corresponds to the three lines of kami-ku.)

STYLE DECLARATION ZEN ÆSTHETICS   sabi =  a certain unpretentious rusticity, an archaic imperfection shibui =  "good taste" with sobriety, excluding display and ostentation