First we used a photograph of a tree and traced the 'negative spaces' (the shapes made by the spaces between the branches)- inspired by Mondrian's work in Fig.1 and Fig.2.
Then we replaced these shapes with rectangles. Like Fig.3 and Fig.4.
After that we used the primary colours - red, yellow and blue to shade some of the rectangles.
Finally we created some of our own paintings based on Mondrian's most famous style (Fig.5). We used mainly primary colours but also some secondary colours.