The Parting of Lot and Abraham, mosaic in the nave of Santa Maria Maggiore, Rome, 432-440
A method of representation used in Early Christian and medieval times which simplifies all meaning into body attitude and gesture. (Gardner)
This mosaic also features a 'device' called 'head clusters' . One set of clusters are the people 'for' and behind Lot and the other people who back Abraham. This method has a long history in Christian art.