Squares, lines, colours: This abstract linear approach to art helped the Dutch painter Piet Mondrian (1872-1944) gain fame around the world. Mondrian, who, many art historians would argue, was the inventor of the abstract, would have turned 150 this year. To mark this jubilee, the museum with the world’s largest collection of Mondrian works is now honouring the artist with a major exhibition. Running until September, “Mondrian Moves” in the Kunstmuseum Den Haag features major works in a gallery that even has its own dedicated soundtrack – techno music made in the style of Mondrian’s abstract m…