Constructivism

A crucial period for Kubíček is the end of the 60s, when he became acknowledged as a pioneering Constructivist artist. Artistically he reconceptualized principles of surface subdivision, contrasts, contraposition and rotation, working with basic shapes (especially the circle and the square) and lines (vertical, horizontal and diagonal).

In 1968–70 Kubíček created plastic objects made of plexiglass and novodur (styrenic resin). He also considered transforming some of his images into three-dimensional forms or incorporating them into architecture. However, he didn't have a chance to realize these ideas during his lifetime.

At the beginning of 1970, he exhibited the first Czech minimalist installation at the Václav Špála Gallery in Prague. He abandoned colour and expressed basic ideas by using only black and white. He tried to exhaust all possibilities of relationships between lines and surfaces. His artistic analysis became gradually reduced and very minimalist.