The drawing of the Pope shown in this picture was a gift from the gentleman bending over laughing directly behind it. They are all laughing and smiling because of the Pope's comments regarding the drawing of himself. No other person on the planet wears this white clothing . It is the most recognized attire of arguably the most well known human on the planet. The color of all the clothing worn by the people in the picture would have detracted from the expressions on their faces... thus B and W