The first documented exhibition with Sivert is from 1961. He participates with his friend Ulrik Samuelson and Mårten Hultenberg with their first works at Skara Konstförening. The images from the preparation for the exhibition describe the beginning of a long artistic career and friendship between Sivert and Ulrik.
"Skara Konstförening and the Bladhska Gallery were founded in 1942. The purpose of the association is to awaken, maintain, and spread interest in visual arts by organizing exhibitions of artworks, lectures, study activities, and other activities within subjects related to art. The Bladhska Gallery is today an art and exhibition venue at Skolgatan 1 in Skara, run by Skara Konstförening in the historic Bladhska House. The ground floor initially housed Skara Brännvinsbolag and later a grocery store run by the Bladh family (which gave the house and the gallery its name)." /JÖ