I have been writing an introduction to the Christian faith, a kind of catechism. The conceit is borrowed from, George Herbert, the great Anglican poet/priest of the 17th Century, that the church building itself is a symbol of the structure of our faith.
The Temple of the Lord - the place, mental, communal, spiritual within which we are given faithfully to dwell:
the narthex (entryway) coming to faith
the stained glass - seeing all things in God’s light
the altar - the center of attention and action, Jesus Christ
the nave - the Christian life
the buttresses, carvings, etc.,- in the Anglican style
the exit - mission, the last things
Now at mid-point we begin a description of the nave.