I believe that element is called
flying buttresses.
Flying buttresses support the walls of a building and given that they are quite slanted, they seem as if they are forming an arch with that particular wall they are leaned against. I've attached an image of them for you to see what I mean.
Steven universe it’s from Steven universe
The New Negro Movement encouraged artists to seek their artistic roots in traditional African art.
The New Negro Movement is what was also referred to as the Harlem renaissance at the time. This movement took place in the 1920s and in the 1930s.
The movement focused on the creative lives of African Americans in the United States.
There was a flow in literature and art in this time period.
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