Turner Contemporary, Margate. Until 21 September
Piet Mondrian declared that he was not interested in painting pictures, but that his art was about "seeking truth".
For him, this search came to mean reducing images of the things he saw around him to their most objective essence - to remove the subjective and thereby achieve clarity.
Mondrian's most famous works, the grids, use simple horizontal and vertical lines to separate the bright primary colours of red, yellow and blue to create a "universal harmony". It is easy to see the effect Mondrian's abstraction has had on areas of graphic design and architecture.