Stylistically, haiga vary widely based on the preferences and training of the individual painter, but generally show influences of formal Kanō school painting, minimalist Zen painting, and Ōtsu-e, while sharing much of the aesthetic attitudes of the nanga tradition. Some were reproduced as woodblock prints. The subjects painted likewise vary widely, but are generally elements mentioned in the calligraphy, or poetic images which add meaning or depth to that expressed by the poem. The moon is a common subject in these poems and paintings, sometimes represented by the Zen circle ensō, which evokes a number of other meanings, including that of the void. Other subjects, ranging from Mount Fuji to rooftops, are frequently represented with a minimum of brushstrokes, thus evoking elegance and beauty in simplicity.