In the early part of the 20th century, there were a number of Japanese poets, such as Kawahigashi Hekigoto, Ogiwara Seisensui, Noguchi Yonejiro, Taneda Santōka, Ozaki Hōsai, Nakatsuka Ippekirō, and Ban'ya Natsuishi who were less concerned about some traditions of haiku such as the inclusion of kigo.