A comprehensive interior and façade renovation was carried out at the Sisak Cultural Center “Kristalna kocka vedrine”, including the addition of an external staircase. The main focus was the reconstruction of the projection hall, while complementary functions such as the bar and wardrobe were also redesigned. The architectural identity is highlighted by the white cubic volume at the entrance, symbolically reflecting the building’s name. The design emphasizes improved materiality, with a refined palette of pink, blue, and white, enhancing both the aesthetic and functional qualities of the center.