在战后，艺术规范和严谨的传统艺术受到艺术家的挑战。 「不定型艺术（Art Informel）」 是 1940至 1950年代在法国开始的艺术运动。它追求自发性和自由性，并探索超现实主义的艺术表达。当时位居法国的今井俊满和堂本尚郎是该艺术运动的日本成员。今井的作品使用鲜明的色彩和爆发性的笔触同时结合自然与艺术的日本美学意识。堂本以厚涂的油画表现漩涡般地跃动，衍生出新型态的作画。这两位艺术家于 1953年将 「不定型艺术 」的意念带到日本，卷起「不定型艺术炫风」，对日本具体派的兴起有巨大的影响。

Founded in 1954, with the aim to go beyond abstraction and pursue enthusiastically the possibilities of pure creativity, Gutai Art Association emphasized that Gutai art does not alter matter but rather speaks of the delicate interaction between spirit and matter that ultimately enables art to tell a story. The name “Gutai” was meant to “present concrete proof that our spirit is free.” In the exhibition, artworks of the two female Gutai members, Atsuko Tanaka and Yuko Nasaka would be presented. Their admission to the association reflected its gender awareness which confronted the gender subjectivity and low status of female artists at that time. Tanaka took inspiration from electrical diagram, where uncounted circles are intertwined with lines. She uses consistently synthetic resin enamel as mediums. With its glossy matiéres and vivid colors, her creation shows outstanding presence. Nasaka continuously experimented with materials, texture and color through her constant circle paintings. Conveying infinity, circle becomes her lifelong motif for creation.