Answer:
"Matrices for printing types were made of copper. However, in printmaking the matrix is whatever is used, with ink, to hold the image that makes up the print, whether a plate in etching and engraving or a woodblock in woodcut."
A principal of design that i see in the image is unity because the room represents the ocean and there are fish surrounding which brings everything together and balances out the message the author is trying to get across. hope that helps :)
Hi! I got into LaGuardia a while ago and I'm a soprano-alto. I reccomend show songs such as if I loved you from carousel, the beauty is from the light in the piazza, memory from cats, or any christine song from phantom of the opera. Good luck!