However this may be, what is essential, from the sociological point of view, is that Islam, like every other ideological movement, created on the one hand a new community which endows its members with a distinct identity and, on the other hand, a specific ideology, a cluster of ideas which project an ideal society. The community in question, Islam, may believe that in certain periods of its existence and in some sectors, it has truly realized this ideal. This is what the sociologist Karl Mannheim calls an ideology in the restricted sense. In other periods and in other sectors, the community has determined that the ideal is yet to be constructed. This Mannheim calls a utopia, without necessarily implying, as the usual meaning of the word would have it, that the ideal is unrealizable. The question of the possibility of realization is left open, and remains subject to the individual judgement.