collage on paper Dimensions: 37,5 x 37,5 cm signed and dated lower right "Jan Kubicek 1971" verso signed, dated and indiscribed: „Krizove elementy s principem kontrapozice“, 1971   Provenance: significant collection Prague   Consulted with Professor Jaromir Zemina and Dr Jiri Machalicky. Confirmation of authenticity attached.