I would say that Love is a common theme in pop songs.
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What’s the method? then I can answer the question.
It would be the 5th valve
Interestingly, all of these subjects are combined in linear perspective, which uses geometric lines and a vanishing point to give the illusion of depth and space to painting. Giotto, Brunelleschi, and Alberti experimented and/or wrote about linear perspective and helped pave the way for future Renaissance artists.