 Qualcomm Stadium's square-circle "octorad" layout was considered an improvement over the other cookie cutter stadiums of the time, and it was the last of the old multi-purpose stadiums to host a Super Bowl (Super Bowl XXXVII).More modern multi-purpose stadiums have used more elaborate methods to accommodate multiple sports; Tottenham Hotspur Stadium, for example, uses two sets of turfs, one a movable natural grass surface for soccer, and the other a synthetic turf surface for gridiron.To accommodate the different sightlines preferred in each sport, the soccer surface is positioned several feet above the gridiron, so that the seats are closer to the field in its soccer configuration and elevated above the sidelines and coaches in its gridiron configuration.