The Tree of Rebirth
The Tree of Rebirth is a tool to contemplate the finite limits of each individual life and the infinite cycle of rebirth. The Tree incorporates key symbolism from The Chamber of Reflection ritual practiced in certain Masonic rites. The Skull and the hourglass are to focus your thoughts on the mortality of your current existence. The skull represents death, and the hourglass symbolizes the waning days of your life. This reminds us that all men are equal by being born helpless, and eventually dying. The following is a detailed explanation of the chamber of reflection. http://hedgemason.blogspot.com/2015/05/the-chamber-of-reflection-ancient.html
The ancient symbol of the seed of life resides in the mouth of the skull and in both eyes. The Seed of Life symbolizes the sacred writings of humanity. The multiple seeds symbolize the choices you have before being reborn. From the Seed of Life grows the tree of rebirth. It penetrates the skull of mortality and reaches to the sky. The following link describes the ancient and complicated symbolism of The Seed of Life. https://www.uniguide.com/seed-of-life-number-7-sacred-geometry
The tree represents blending of the finite life with the infinite cycle of rebirth. The tree represents the blending of the fruits of knowledge from previous lives into future existence. The purpose is to focus on how your tree is creating the fruits of your future existence. The hourglass shows the amount of time you have left, and the skull represents your future destination into mortality. The actions of your prior life provide the fertilizer for the seed of life to regenerate your existence through the tree. Your next existence is predicated by the actions of your prior existence. Please use the tree to meditate on the ebbs and flow of existence.