What academic subject provides the structure for escher’s artwork, yet he struggled with while in a student in school

I’m a paragraph of no less than 125 words, explain the single most important factor involved in advancing american classical music in the twentieth century.

Answer quickly will mark as brainliest . what type of sculptures were created by the olmecs? how did they get the materials needed to make the sculptures?

Is the classification for an instrument that produces sound by vibrating a string or strings stretched between two points