However, art production in B&H was severely restricted, leading many artists to never retur to B&H from their studies in Zagreb and Beograd, while many were leaving the country. The first renewal happened with the "“Group of Four”" and "“engaged art”" of Roman Petrović and his circle, "“The children of the Street”." Mijić and "Đoko Mazalić" founded an art association called "“Krug”" (The Circle) with strong focus on urban aesthetics of nature. Vojo Dimitrijević painted "“Spain in ‘37”", a representative artwork of colouristic expression with traces of Picasso and Chagall.