To give an example, two chess players might be engaged in a bitter struggle at the board, but they share all sorts of Background presuppositions: that they will take turns to move, that no one else will intervene, that they are both playing to the same rules, that the fire alarm won't go off, that the board won't suddenly disintegrate, that their opponent won't magically turn into a grapefruit, and so on indefinitely. As most of these possibilities won't have occurred to either player, Searle thinks the Background is itself unconscious as well as nonintentional. To have a Background is to have a set of brain structures that generate appropriate intentional states (if the fire alarm does go off, say). "Those brain structures enable me to activate the system of intentionality and to make it function, but the capacities realized in the brain structures do not themselves consist in intentional states."