Have they not observed the birds [how they are] made subservient, disposed to [be able to] fly, in the air of heaven?, that is, in the air between the heaven and the earth. Nothing holds them, when they draw in their wings or open them, lest they fall, except God, by His power. Indeed in that there are signs for a people who believe, [the signs] which are that they have been created in a way that enables them to fly, as well as the creation of the air in such a way that it allows for flight, and the holding of them [up in the air so that they do not fall].