Differences are what make human beings feel alive. This aliveness is what everyone is searching for. This is the reason we go on vacation, this is why we like scary movies, and why our birthdays feel special...it all has to do with changing things up in our lives. If things stay the same for too long, then we become bored. It's the same way in our art. If everything's the same, it's boring for us and for the viewer. Differences of size, shape, and color are just a few of the differences we can use to make our art stronger - not only more interesting to make, but to look at as well.