Semsar Siahaan (1952-2005) was an icon of art activism in Indonesia. A fervent humanitarian activist, Siahaan fought courageously during a time of vast changes to Indonesia's political landscape, which reflects in his body of work. His keen and incisive social commentary through his art was an integral part of the anti-dictatorship and pro-people movement of the 1990s. Semsar was known for leading the rebellious student art movement of the 1980s, and the various labor rights activism the following decade.

His installations and some of his paintings and drawings dealt directly with the abuse of human rights, and have become important signifiers of a distinct political climate in young contemporary Southeast Asia. Semsar's work mostly exuded a sense of realism as he always intended to immortalise humanism, challenging the social injustices that occurred. His frequently mentioned works included Olympia: Identity with Mother and Child and the magnificent G-8 Pizza. Cerita: Menceritakan kisah sebelum orde baru dimana Pulau Jawa pada saat itu berkembang pada bidang Pendidikan maupun pekerjaan. Oleh karena itu, Pulau Jawa ingin menguasai Pulau Kalimantan. Terlihat bahwa topeng Dayak yang digunakan pada figure orang, yang dipaksakan untuk menggunakan topi kraton yang ada di atas nya.

Story: Tells the story before the New Order where Java at that time was developing in the fields of education and work. Therefore, Java Island wanted to control Kalimantan Island. It can be seen that Dayak masks are used on human figures, who are forced to wear palace hats on top of them.