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.

answer; /// i believe the correct answer is general act charters;