'Sephirot' is Hebrew for emanations. This poster represents the 10 emanations in the Kabbalistic Tree of Life. "This most fundamental concept of Kabbalah is that in the process of creation an intermediate stage was emanated from God’s infinite light to create what we experience as finite reality." (from here) The left side represents power (female) and the right side represents unity (male). The middle represents balance between the two sides (mercy and justice).
I was first introduced to Kabbalah art when I was in Israel 3 years ago. We visited a mystical art gallery in Tzfat founded by Avraham Loewenthal.