Striking in the work of Wjm Kok is his interest in monochromes, whether as open or closed series, the latter being limited in number as a pure consequence of a conceived system. He wants to make series that are not a goal in itself, but rather a result of a method to keep as far away as possible from an emotional choice. He likes to make work that is not hierarchical and that also does not refer to a pronounced uniqueness.
In the open series 'Off Color', Wjm Kok mixes a color directly on the canvas with the help of seven ad randem tufts of paint squeezed from the paint tube. The color is not easily predictable and often also produces a surprising effect for him during the making.