Answer:
1. The wings/backstage/offstage
2. Apron
3. Pantomime
4. Cyclorama
Explanation:
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