Answer and Explanation:
There is no attachment so I'm guessing the picture you're talking about has a large 5 and smaller ones repeated smaller behind it.
Harmony is when an artwork is visually appealing to one's eyes. The warm colors of the reds and yellows match with the cooler colors of black and blue. The repetitive 5 creates harmony as well. This artwork also has variety. The different sizes of the 5s show variety. Also, the different shades of the yellows, reds, and blues create variety.
I'm not sure if what I think you're talking about is correct but I helped a friend of mine with her art class and the image you are describing sounds familiar.