Logic of forms in 2D matrix I-IV. (Bock) – 1974 – 360x240cm – canvas, acrylic május 21, 2015 • 1970 × 1293 • Logic of forms in 2D matrix I-IV. (Bock) – 1974 – 360x240cm – canvas, acrylic Logic of forms in 2D matrix I-IV. (Bock) – 1974 – 360x240cm – canvas, acrylic