Don is a contractor surveying the progress on a home being built. although the frame isn't complete, he can still get a sense of what it will look like. this illustrates the principle of

Closure

Explanation:

He is having a human visual perception of something that he has in his mind. The principle of closure (Gestalt psychology)  is the illusion of something incomplete but someone is seeing it as complete like it is in their mind.

For Don, he has a visual perception of the frame even though it isn't finished.

the answer is solomon northrup. he was a free-born african american, abolitionist and professional violinist that was drugged, kidnapped and sold as slave in 1841 and remained in captivity until 1853 where he regained his freedom with the of the then-governor of new york, washington hunt. he wrote and published his memoirs "twelve years a slave" in 1853, and in this text, he tells the story of his escape thru one of louisiana's swamps (the great pacoudrie swamp) in which he ended up covered in green slime from crossing the surface of the dead water.

answer; a team- maintenance role;