In Oroborous (or vertical bands matched horizontally one by one), the software creates a set of vertical bands until all possible numerical colors are used without repetition. As background color samples are displayed, the computer matches each of the individual vertical bands with a horizontal band sequentially from left to right, when it reaches the end, another background is displayed. Once the 16.7 million colors have been matched and displayed, a new set of backgrounds is created and the process begins again.