On May, 20,1975, members of the Studentsko satirično glumište / Student Satirical Theater (SSG) at the premises of Savska street 25, changed the name to Kugla glumište / The Sphere Theatre. Kugla glumište was one of the most important theaters, multimedia and interdisciplinary art groups in Yugoslavia, and particularly Croatia. It was active between 1975 and 1985, after which the theater divided into the several fractions, some of which work until today.
Kugla glumište created a new concept of theater. Instead of theater's traditional form, Kugla glumište proposed theater as an urban ritual and social situation. It departed from the concept of theater as a "square" with clearly allocated role of spectator, and introduced the concept of theater as a "sphere", a non-drama theater, total theater, theater equaled to life. In 1985, Kugla glumiste divided into soft and hard fractions. Damir Bartol Indoš, winner of the Medal of the City of Zagreb for theater in 2009 and the main representative of the theatre's hard fraction, continued to pursue the genuine aesthetics of the Kugla glumište to this day.
Members of Kugla glumište were: Zlatko Burić, Dunja Koprolčec, Anica Vlašić - Anić, Zoran Šilović, Heda Gospodnetić, Dragan Pajic Pajo, Dragan Ruljančić, and Damir Bartol Indoš.