The new ritornello material is followed by new music for the chorus. In this section, they sing the words "Steht auf!" (Arise!). For these words, Bach uses word-painting; he makes the music directly reflect the meaning of the words.
Answer from: Quest
a static shape has a fixed relationship between all of its vertexes. a dynamic shape can vary the position of at least one of its vertexes in relation to the others.