With major exhibitions opening in Japan and North America this year, 87-year-old Kusama Yayoi, known for her “obsessive” repetition of polka dots and reticulated patterns, is one of the most widely admired figures on the contemporary art scene today. Longtime champion Tatehata Akira traces the roots and evolution of her eccentric yet highly compelling idiom, from the “naked happenings” of the 1960s to the dazzling “pumpkin” installations of recent years.