Around the edges of the room, Okell noticed great sheets of white canvas. They were arranged into enclosures, like voting booths, except each one seemed to have a peephole cut into it at eye level. The average visibility from the bridge of a warship is five miles, Roberts explained. The canvas sheets were positioned in such a way that, when a player peeked through the slit, he or she could see the equivalent of a five-mile view of the tiny wooden ships on the floor. Linen side wires, which could be bent to adjust visibility, depending on the game scenario that was being played, held the
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