Sabrina attended an opera. What did she MOST likely experience? A Performers wore basic, simple attire with no costumes.
OB. All of the music was instrumental with no voices.
C. The stage was simple with few decorations.
D. Singers told a story through their songs.

Photography has changed its subject matter quite a lot over the past few years. in the 1800's, it was considered normal for families to have  post mortem photos of their loved ones, and now that would be completely unacceptable. i think that photographers have always pushed boundaries and have been eager to capture everything, it is just society that changes their boundaries.

Perspective is important because it enabled the 3 dimensional world to be translated into the 2d world of the picture plane. this had an immediate impact on the representation of reality in art and design. 

This would be tesserae.