Contemporary society is marked by the separation of culture from religion, desacralization, and cleavage between sacred and beautiful. Considering the modern stratification of sacred in front of sacral art, it is a perpetual challenge how to symbolically enunciate holly. The altar´s mosaic of Ede Murtić devoted to the Exaltation of the Holy Cross has a profound spiritual and theological message even though at first glance it looks revolutionary and inadequate to the baroque ambiance of the liturgical space. This rare and courageous example can be used in further theological research of the relationship of contemporary sacral art to liturgical themes. This research aims to analyze the wall mosaic of Ede Murtić, which adorns the presbytery of the sanctuary and church of Saint Eustace in Dobrota, from the theologicaliconographic aspect. The artist's composition with its layout of symbols, style, and coloring differs significantly from antique and byzantine mosaics which seem statically. Murtić is a painter of abstract expressionism, and his altar´s mosaic set in the church of St. Eustace, with its dynamic and freestyle, enters deeper into the baroque space by connecting tradition and modernity. Motive "Thank you for being in this world", at the same time points to transcendent and worldly, the beauty of God and the beauty of nature. The mosaic dedicated to the culture of the Exaltation of the Holy Cross is filled with a rich symbolism that refers to the victory of the cross and the Eucharistic celebration. Edo Murtić is one of the foremost protagonists from Croatian post-Modernism. That is the reason why this paper wants to investigate how his work fits into the baroque environment? Why did the Mostar's Franciscans reject his work and don Branko Sbutega accepted it? Is it about the theological-iconographic aspect of a defective act? How does this revolutionary work, of contemporary sacral art, refer to the cult, spiritual and liturgical dimension?