Big Bob develops colour when he releases the anger that built in him. He is the leader of some people who remained black and white most of the, they are terrified of the unexpected and they want to get everything back like it used to. The Mayor and other council members made some rules hoping they will stop any further changes from the town but none of them worked. People continued changing their behaviours and increasing their knowledge. Big Bob remains black and white most of the time denying that he even have emotions in him. He turns in colour at the court scene when David makes him angry in front of the people.The Mayor runs out of the court with humiliation when he realises that he was wrong all the time. After that event, all of Pleasantville
