The basic purpose of contrast is to... create interest on the page and aid in the organization of the information.
create interest on the page and aid in the organization of the information.

repeat elements to create a sense of unity.
repeat elements to create a sense of unity.

draw your eye to the white space of the composition.
draw your eye to the white space of the composition.

align the content so it is easier to comprehend.

satin. 

"very shiny satin may look great in the fabric store or in the sewing room, but once onstage it can look fake and cheap as it reflects the light from the fixtures."

"prior to 1910, these new artists were called neo-impressionists, and they believed that "modern paris" was the proper subject for their paintings."

this is the text provided by the program, disregard other answers, as they are confusing and based on loose knowledge of the subject.   : )