The medieval Kabbalists of the northern Israeli town of S’fat reinvented the holiday of the 15th of the month of Shvat, or TuB’shvat. What had in Torah simply been a “birthday for the trees,” to count the age of the tree to three years, before one could harvest its fruit, the Kabbalists made into a holiday replete with appealing symbolism. For them the “tree” that was in the midst of the Garden of Eden, (Gen 2:9) was, obviously, the “tree” of the sephirot; the conceptual diagram of the emanations of God. But this tree is different: It has its roots in heaven! And when we do mitzvoth, with the proper intention, we eat the fruits of that heavenly tree here on earth. The swirls around the outside of the image represent the shefa, the constant flow of God's bounty into this world. When we do mitzvot, we cause the flow to return to God. The various colors from white to red are the colors of the wine we drink during this seder, representing Four worlds, or realms, from heaven down to our earth. See the companion illumination: Four Worlds. The white space at the top represents Ain Sof---"without end," beyond our understanding.