Pablo Picasso’s 'Guernica' (1937) is one of the most powerful anti-war paintings in history, but its monochromatic palette was a specific choice. Picasso chose to paint it only in black, white, and grey to mimic the starkness of newspaper photographs, which is how he first learned of the Nazi bombing of the Basque town of Guernica during the Spanish Civil War. The painting is filled with symbolism: the lightbulb represents an 'evil eye' or modern technology's role in destruction, while the horse and bull represent the suffering of the Spanish people. During WWII, a Gestapo officer allegedly asked Picasso about the painting, 'Did you do this?' Picasso famously replied, 'No, you did.' The mural-sized work toured the world to raise funds for Spanish war relief and remains a universal symbol of the horrors of conflict.