Traditional pools tend to be of a geometric shape, either some rendition or a rectangle, square, circle or oval. Geometric pools are also known as contemporary, classic, roman, Grecian-styled swimming pools. Geometric pools have an elegant simplicity that is timeless and stunning. Considered to be a traditional pool design, rectangle pools are among one of the most popular designs. This is because of the formal lines that fit a homes or buildings silhouette. Rectangle pools are also ideal for swimming laps.