Chapter V-B. Arrangement of a Church for the Liturgical Assembly
257. The people of God assembled at Mass possess an organic and hierarchical structure, expressed by the various ministries and actions for each part of the celebration. The general plan of the sacred edifice should be such that in some way it conveys the image of the gathered assembly. It should also allow the participants to take the place most appropriate to them and assist all to carry out their individual functions properly.
The congregation and the choir should have a place that facilitates their active participation. 
The priest and his ministers have their place in the sanctuary, that is, in the part of the church that brings out their distinctive role, namely, to preside over the prayers, to proclaim the word of God, or to minister at the altar.
Even though these elements must express a hierarchical arrangement and the diversity of offices, they should at the same time form a complete and organic unity, clearly expressive of the unity of the entire holy people. The character and beauty of the place and all its appointments should foster devotion and show the holiness of the mysteries celebrated there.