In the midst of the covering and veil, where the priests were allowed to enter, was situated the altar of incense, the symbol of the earth placed in the middle of this universe; and from it came the fumes of incense. And that place intermediate between the inner veil, where the high priest alone, on prescribed days, was permitted to enter, and the external court which surrounded it—free to all the Hebrews—was, they say, the middlemost point of heaven and earth. But others say it was the symbol of the intellectual world, and that of sense. The covering, then, the barrier of popular unbelief, was stretched in front of the five pillars, keeping back those in the surrounding space.