One difference between a renaissance mass and a motet is: a mass is sung unaccompanied, a motet has instrumental accompaniment a
mass has only step-wise melodies and unmeasured rhythm. both the melody and rhythm of a motet are more irregular. a mass is always based on a specific text that is part of the liturgy of a given day. a mass is sacred, a motet is secular
One of the main differences between the renaissance mass and a renaissance motet is that the mass is always based on a specific text that is part of the liturgy of a given day. Motet is not connected to some specific text that is part of the liturgy but is also like the mass usually sacred.
During the Song dynasty most likely landscapes would be painted to show things with relative permanency compared to the changes in society and also to show the natural hierarchy as a metaphor for a successfully regulated state.