Question: How is the upper world attained?
Answer: When ten people nullify themselves relative to each other and they do this together relative to the Creator by wanting to attract Him as Ohr Makif (Surrounding Light) to correct them, that is how they create the characteristic of the Creator among them.
Through this action they create a Kli, which is a sensory device for attaining the next level. In this single desire they feel the Creator. After that, by uniting more and more deeply, they discover the Creator more and more.