New imagery of proportions
Baertling abandoned Op art, which had once inspired him, and started to create a style entirely his own, in which triangles and diagonals became the main theme.
From basic geometrical elements, he built up a new imagery of proportions and synthetic, programmed colour harmonies. Intense fields of colour enclosed in black diagonal contours create a dynamism that few other artists managed to achieve.
These slightly arched black lines, which Baertling himself called “sabre lines”, were added at the very end.