Negative space enclosed by letterforms is called counters.
Negative space is white space that letters such as O or D have (enclosed white space within the letter). Well, in typography, that white/negative space is called a counter, or aperture, or inner space, or enclosed space.
Certain elements from the Roman civilisation could be one of the main inspirations of the architectural structures of the famous romanesque churches. The romanesque architecture is primarily characterised by having excellent qualities involving large spires and very thick walls.
It could be a simple three voice melody
