Lamb of God modern Roman Catholic Christology, Karl Rahner has continued to elaborate on the analogy that the blood of the Lamb of God, and the water flowing from the side of Christ on Calvary, had a cleansing nature, similar to baptismal water. In this analogy, the blood of the Lamb washed away the sins of humanity in a new baptism, redeeming it from the fall of Adam. In the Mass of the Roman Rite and also in the Eucharist of the Anglican Communion, the Lutheran Church, and the Western Rite of the Orthodox Church the "Agnus Dei" is the invocation to the
Missa Papae Marcelli effect. This was a new technique, using "tonal planning" to replace imitation as the means to keep the music moving forward. The Agnus Dei returns to the imitative polyphony of the Kyrie (the opening of Agnus Dei I repeats that of the Kyrie). As was frequently done in the 16th century, Palestrina adds an extra voice in Agnus Dei II, making seven for this movement, in which is embedded a three-part canon that begins with the head-motive. Missa Papae Marcelli Missa Papae Marcelli, or Pope Marcellus Mass, is a mass "sine nomine" by Giovanni Pierluigi da Palestrina. It is his