Harmony in art overall is achieved when the elements of an artwork come together in a unified way. Certain element can be repeated, yet they still look and feel like they are lending themselves to a whole. Harmony is definitely not monotony but also not chaos.
I know someone already answered, but since you only have four choices here I wanted to elaborate just in case! I’d go with unity, to have that element creates a general sense of wholeness or blended “harmony” in a work. Unity and harmony are sometimes used interchangeably in the art world so you can use whichever is listed as your option. hope this helps!! :)
<span>The correct answer is Philip Johnson. The Seagram Building was a skyscraper in New York that was designed by the German architect Ludwig Mies van der Rohe together with Philip Johnson that designed some internal aspects of the building.</span>