Complementary colors are any two colors directly opposite each other on the color wheel, such as red and green or red-violet and yellow-green. Picasso's famous painting Guernica from 1937 prominently features complementary colors of orange and blue to depict the bombing of a small Basque town by German and Italian air forces.

1. Complementary colours Complementary colours are any two colours which are directly opposite each other, such as red and green and red-violet and yellow-green.

2. orange blue Red violet Yellow green

9. Guernica , Pablo Picasso, 1937. Museo Nacional Centro de Arte Reina Sofía