The Uffizi's treasures are on the top floor which houses an extensive collection of early Italian Renaissance art. I posted earlier about the pivotal works of Botticelli, Leonardo da Vinci, and Giotto... The photo here is looking out of the upper hall lobby of the Uffizi toward the Arno River and the Ponte Vecchio Bridge.
The impression I receive after touring 5-6 galleries is that early Renaissance art marked a rediscovery in the beauty of the natural world. There was more to the world than just a preoccupation with the Bible stories. Nature, the general activities of people, an interest in classical learning, math, and science lead to a softer, more vibrant side to the human experience. This perspective can be seen in the faces and activities of the people portrayed in the art.
(Sorry for the paragraphing problems. I am experiencing some formatting problems out here.)