DNA is sequenced by labeling each of the DNA letters with a different color. As the molecules moves pass the detector, this sequence of color is read. It was in this way that the 3.5 billion letters of the human genome was read. This visualization, part of the DataStream exhibit at the DNAtrium, shows actual sequence data from the Broad Institute sequencing center. What you're seeing is the work of 1 (out of 117) machine processing 96 samples at once, each sample gives about 1000 letters of information. Here, the whole rabbit genome estimated to be 2.3 billion letters long is streamed from beginning to end.