The holy of holies was the house of the lord where the Ark of the Covenant was stored. The first was a traveling design made during the conquest of the Promised Land. Building the temple was considered equivalent to building people. The Levites were responsible for re-erecting the temple in permanent form. No one knew the real image but I consider this opinion in a revelation which made in accordance to church illuminations. The ark was an image of the world, it also the individual and of the human state. The symbol of the cross is the real consider. Thus the building of the holy of holies will have the intersection of vertical and horizontal walls. The horizontal wall represents people having sensual drives towards the material world which leads to second death. The vertical suggests the call for the inner behavior as the true force that bring the eternal state of life. The visible and the invisible work resides whit the eternal life. The cross shapes of the holy of holies covers the shape of four corners around the time of the judgment, which is an important part of creation. As the individual prays in front of the ark, he is embracing the universe which is the house of God.
The holy of the holies was the first place to search for the truth. The birth is marked with innocence but the life is a penalty to overcome.