"Structure" is a cut-out frame painting that corresponds to the Madí stage of Martín Blaszko's work. This period of his production is related to the early approach to the artists who presented their works at the residence of the photographer Grete Stern. The musician Klaus Erhardt, who was part of Blaszko's circle of friends, invited him to attend the meeting organized by the Concrete Art-Invention Movement (MACI), where he saw for the first time the productions of Arden Quin, Gyula Kosice and Rhod Rothfuss, which not only focused on the idea of pure invention, but also responded to the novel proposal of the cut-out frame. As Rothfuss had warned a year earlier, the problem with regular frames was that, by following the "window" concept of naturalistic paintings, they gave the impression that the subject of the work continued beyond its limit; therefore, in his article he proposed working with irregular frames structured according to the composition of the painting.