The Dutch artist Piet Mondrian made paintings that were all about coloured squares and rectangles. He measured the shapes that were in proportion to one another in the way that was the most attractive.
He used black and white and a few plain colours, especially red, blue and yellow. Many people find these paintings peaceful and beautiful. They influenced lots of artists and designers. His ideas were copied in posters and book covers, in architecture, and in fashion. The rock group The White Stripes used similar images for an album cover in 2000.