Haiku is a traditional Japanese poetry genre, challenging the poet to maximize imagery while minimizing verbiage, all within a prescribed structure: elegance balanced by economy.
The poet is limited to three lines, with the first line further limited to five syllables, the second line to seven, and the third, again, five.
Thus, the artist is employs three colors: the first limited to five strokes, the second to seven, and the third to five. Human elements are portrayed within a natural context, or the reverse.