1= form and light
2=depth
refer to these websites for more info on both illusions
1- thevirtualinstructor.com/hatchingcrosshatching.html
2- www.udel.edu/artfoundations/beg_paintingtechniques.html
Explanation:
Taekook lol is the brainliest answer
I think it was priests and nobles because before the printing press was invented they made written copies of the bible.