I was working on a brownish ochre and oxid red painting. I overpainted parts with pthalo blue and magenta which made it look horrible. Then I mixed some blue parts with azo yellow. This saved the work. It is difficult to say how it did save it. It was not realy the color in itself that realy fitted. I think the quantity of the colour fields became more balanced now. There was a rhythm starting to develop betweeen the coloured parts. So I think Jan Verwoert was right when he said that rhythm is one of the most important aspects of a composition. It is not the colour in itself which is most intersting but the quantities of colours opposed to eachother which create a rhythm.