Orthodox means "right praise"; it does not mean right thinking. Liturgy is a source of Catholic teaching. We must always make sure that we are "praising rightly." Begin by looking at what we are doing, reflect upon it and then make changes as necessary to achieve orthodox liturgy.
Three essential elements of celebration:
Affirmation of Life -
We celebrate what we affirm. In terms of liturgy, we celebrate the life of the Church in the sacrament.
Juxtaposition is two things that are opposite but going along at the same time. Here is a good example: At Thanksgiving dinner, you have all this food in front of you and someone remembers to pray for the poor. You are full, but you are empty at the same time. Or at that same holiday celebration, you feel the joy of som many family members, and then someone comments that it's the first Thanksgiving without grandma. This mixture of sadness and joy are examples of juxtaposition.
In liturgy, we find juxtaposition in the Paschal Mystery - the death of Jesus, which we need to experience true life.
Conscious Excess -
This is an awareness of the fact that you are choosing to go "overboard." In terms of liturgy, conscious excess is when you take what works and go beyond the minimum to "heap good things" upon the Lord and the people of God to express our love and gratitude. It is found int he music, the way we proclaim the Word of God, our art and environment and the manner in which we provide hospitality at Mass.