Nice catch. Very interesting. It's a convertable stadium, with movable stands. :)
From the More Info link:
The stands are movable, first of its kind in the USA. The stands are moved by air cushions into different configurations (football, baseball and concert configurations).
From the More Info link:
The stands are movable, first of its kind in the USA. The stands are moved by air cushions into different configurations (football, baseball and concert configurations).