http://www.medievalwall.com/wp-content/uploads/2010/07/Virgin-Mary-Amid-the-Emperors-Justinian-and-Constantine.jpg
I don't see any parallel lines.
In Madonna and Child with Emperors Justinian and Constantine, how would u describe the lines on the platform? Are they parallel or slanting horizontal lines
3 answers
Both. The parallel lines are in the front and the slanting horizontal are on the sides. Good luck.
Also, look at the horizontal lines on the grass, each is painted in a different shade of green.