You may be familiar with Maslow’s Hierarchy of Needs. It’s a theory Abraham Maslow proposed in 1943, that provides a pecking order of human needs. At the bottom of the pyramid are physiological needs: breathing, food water, etc. The fundamentals needed for basic survival. The needs then climb the pyramid, becoming more intangible as one goes along: safety, love/belonging, esteem, self-actualization.
Via Gianluigi Cuccureddu