The Great Portal Window

Directly behind the Altar is the portal window; twelve-feet high and eight-feet wide.  It frames the tabernacle which stands four-foot high within the Holy of Holies. when Mass is being celebrated, the inner room grows dark so that our focus might be on the Mass itself.  To the left and right of the great column are two gold doors leading to the Holy of Holies. First Kings 6 verse 16 speaks of this area which, in Old Testament times,  housed the Ark of the Covenant.