To free the abstraction of all emotion he imitates the color charts of the industrial paint brands, without any fancy in the geometric composition. The carefully aligned rectangles are separated by a narrow white grid.
He begins the year 1973 with gray monochromes and then tries real abstract dialogues between red, yellow and blue. At the turn of 1974 he devotes himself again to his Farbtafeln in lacquer on canvas in which he often removes the white stripes for a mosaic juxtaposition.
The opus 359 painted in 1974 is the most complex and the final of this series with 254 x 254 cm and 4096 colors. It was sold for $ 3.7M including premium by Christie's on May 11, 2004. The other extreme is the opus 353-1 20 x 20 cm with 4 colors which is also the first without the separating grid.
The opus 357-2 painted in 1974, 121 x 124 cm with 1025 separated colors was sold for $ 4.1M including premium by Sotheby's on May 14, 2008. It is estimated £ 5M for sale by Sotheby's in London on March 7, lot 8.
The culmination is achieved in 2007 with the opus 901, 196 lacquered aluminum panels of 25 squares each that form when they are all assembled together a square of 680 x 680 cm and 4900 colors in an interesting example of art adjustable by the user.
SOLD for £ 7.4M including premium