The reflection on the primary linguistic structures of painting accompanies Giulio Paolini's beginnings; from Disegno geometrical of 1960, in which the squaring of the canvas is not the subject of the painting, but is rather aimed at qualifying the support, to the immediately following "Untitled", the artist intends to carry out a recognition of the constituent elements of the framework. The linguistic perspective, in which canvas, frame, frame, line and color become the concrete tools of an empirical attitude, already in the early stages of activity, is accompanied by a semantic and syntactic, determined to derive the scope of the intervention from material qualities of the chosen media. The "Untitled" of 1966, at the center of which the perimeter of a white square is crossed by a slight stroke of pencil, shows itself as a metalinguistic artifice, construction of the picture within the picture; the painted surface, in fact, mimics the space occupied by the rough canvas on the wall and plays with the transparency of the fabric, revealing how the wooden planks that make up the cross of the frame condition the profile of the geometric figure. The equivocal relationship between the subject of the work and its physical support is considerably complicated if interpreted in a wider dimension, such as to include the surrounding space and the viewer. The sense of disorientation produced by the alternation of fictitious and real plans is the result of an aesthetic trap that, experienced above all in the two-year period 1964 - 1965 and perfected, in that turn of years, with the introduction of the photographic technique, founds its own ambiguity on the duplication of the square.