"Already before the war broke out, he devoted himself to painting and graphics (adopting the linocut technique, etching with aquatint). [...] Before the war, Stern was mainly interested in finding his own personal path by giving in to various fascinations (e.g. for some time he remained under the influence of Kandinsky’s works). However, after 1945 gradual but consistent changes became distinguishable in his oils and monotyped etches. Janusz Bogucki commented on them by saying that, as in Stern so in Jaremianko and in Tadeusz Kantor, the works “... move from abstract form towards organic form, whereas in the emotional aspect of the paintings the joy of a beautiful construction partly gives way to motifs of horror and pain. In his oil paintings [however] Stern remains relatively devoted to issues of composition". Towards the end of 1950s the painter visited Italy, where he became acquainted with the art of Alberto Burri, one of the masters of the “painting of substance”. He became interested in painting structure and started introducing to it and adapting in a creative way non-painterly substances. [...] Stern himself took most pleasure from creating his own realities composed of indistinct shapes, which brought to mind the organic world. He used their metaphysical potential and combined them to form unrealistic entities. Half abstract forms floating in a mysterious space stressed the surreal climate of the representations. This was characteristic of numerous of his works, regardless of the technique used. A similar aura characterises the compositions, in which a special focus lies on meaning of the fabric itself: expressed either by plain painting, or by the collage technique." - Małgorzata Kitowska-Łysiak, "Stern Jonasz"

Sitography: ACCATINO, Alfredo, "Jonasz Stern. A sinistra di tutto.", www.ilmuseoimmaginario.blogspot.com, 7/02/2020
ilmuseoimmaginario.blogspot.com/2020/02/jonazs-stern-sinistra-di-tutto.html

KITOWSKA - LYSIAK, Małgorzata, "Stern Jonasz", www.sztetl.org.pl
sztetl.org.pl/en/biographies/3838-stern-jonasz

ZACHETA ART, "Jonasz Stern", www.zacheta.art.p
zacheta.art.pl/en/kolekcja/artysci/jonasz-stern