<P> Because the concepts in physics and politics are at times very complicated or very abstract, Frayn uses several controlling images to better relate certain ideas to his audience . </P> <P> Skiing and Table - Tennis--These two activities are referred to as a pastime of Bohr and Heisenberg's, and both demonstrate the competition between the two (representative of national competition .) They are also used to suggest Heisenberg's speed and recklessness which contrasts with Bohr's caution and tediousness . </P> <P> Invisible Straight--An anecdote in which Bohr managed to bluff himself in a game of poker by betting on a straight that he thought he had, but he really did not . This principle is applied to nuclear weaponry, suggesting that nations will act differently when they think that an opponent can produce nuclear arms, whether or not the opponent can . </P> <P> Cap - Pistols, Land Mines and Nuclear Reactors--These fall into the Toy vs. Weapon theme and once again presents anecdotes of Bohr and Heisenberg's lives . Their fascination in playing with the new toy blinds them to the danger that it poses . </P>

Who takes over denmark at the conclusion of the play