The County Room, with its 80-foot diameter and 100-foot-high ceiling, is stylized after the Mouses Tank at the Valley of Fire .   The blue granite on the floor pattern imitates the life-giving desert pool, while the tan granite depicts surrounding desert sand.   The roof symbolizes light filtering through rock crevices.   The green balconies represent desert vegetation.   Looking out the garden window toward Red Rock Canyon and the Spring Mountains , the corridor represents a desert wash, carved from the desert floor and strewn with boulders.