What Is a Medium of Instruction?

"Medium" is a channel, or a vehicle, or a conduit, or a material, that something
travels through in order to get from place to place.

A Medium of Instruction is the means or process by which learning travels
from the teacher to you.

Here are a few that I can think of right now. I'm sure you can come up with others:

-- lecture
-- printed text
-- Powerpoint presentations
-- recorded lessons with soft music in the background
-- colorful drawings
-- flashy billboards
-- famous singers reciting trig identities
-- numbered blocks

From the excerpt above the best answer would be:

 

The aesthetic impact describes what it was like to be a veteran during the Vietnam war, and the experiences of the person taking care of people. In one of the lines that says: “Brushstrokes flash, a red bird's wings cutting across my stare. The sky. A plane in the sky. A white vet's image floats close to me, then his pale eyes look through mine.” It follows how the veteran talks about the death of the victims and how they will be remembered, the description of the plane may even describe bobs that were falling from the sky.