Imagine a world where artists are falter to fully express the emotion in which they are portraying to their audience. I might go to fewer art museums if this was the case. Giotto Di Bondone is the reason why artists were inspired to flood emotion into their works today. He was the first to put art into the setting of the "human realm" with blue backgrounds to represent the sky and rich earth tones to contrast it. Not only was this the setting of more life like realism it was also the realm of emotion and human characteristics that the audience can relate to. In his paining Lamentation, emotion can be seen from surrounding characters for the mourning of Christ after his crucifixion. In my opinion, if it weren't for Giotto's out of the box thinking and realistic purposes art would not be the same it is today.

Source:
http://www.artble.com/artists/giotto_di_bondone