Picture this. Light travelling through a small lens is captured by a small sensor and turned into an image. Light travelling through a large lens is captured by a large sensor and turned into an image. What's the difference between these two images? Essentially, it's a difference in quality. In the case of the small image sensor, the image is magnified by a high ratio when it's printed or displayed on a computer screen. This makes it tricky to reproduce the dynamism and 3-D feel of the subject. The DP2 does just that by using a large integral image sensor.