A retractable field tray houses the Raiders’ natural grass playing surface. The field sits outside on non-Raiders game days to get the sunshine needed to promote growth. Before the Raiders take the field for games in their new stadium, workers will move the 9,500-ton natural grass field into place on the stadium floor.

Stadium architects devised the elaborate system to grow nearly an acre of grass on a portable tray outdoors and then wheel it into place for games in response to Raiders owner Mark Davis’ insistence that his team play on a natural-grass field. The Las Vegas tray is expected to have 76 motors — enough redundancy so that the field can still move if three motors per side were to fail.

That 80-by-215-foot opening will have lanai doors that can be opened for fresh air on those perfect fall days Southern Nevada is famous for. Those doors and the translucent stadium roof will give the Las Vegas stadium the look and feel of an outdoor venue with a natural grass field. Just above the main entrance to the stadium, the plaza will be ideally suited for fan traffic — from there, some people will move down toward the field level or up to the higher reaches of the stadium cheap seats. Having a main entry where half the attendees go up and half go down is considered the ideal ingress and egress pattern for a stadium. And at the a plaza, an eternal flame will be lit in memory of Raiders founder Al Davis. From there, look to the north and you’ll catch a view of the Las Vegas Strip.

The 93-foot tall Al Davis Memorial Torch that spans multiple levels of the stadium can be seen towering over the main entrance on the north end of the Raiders’ new $1.9 billion home.

The torch is made of carbon fiber and aluminum. It won’t have an actual flame but instead will be a mixture of lights and special effects and a 1,000 gallon water tank. A mist will allow the special effects to come through. The tank sits at the bottom of the memorial

Davis was the team’s principal owner and general manager from 1972 until his death in 2011. The lanai doors are retractable doors that will open on game and event days, weather permitting, giving the 65,000-seat stadium an open feel. A 55,000-square-foot peristyle club will encircle the torch. It is one of nine clubs in the stadium, but it’s the only one open to any attendee who purchased a ticket for a stadium event.