The tree of life symbol has a long history from many cultures.  It symbolizes strength, groundedness, growth, and connection with the universe.  With the roots digging deep into the Earth and the branches spreading out into the sky, the symbol shows the interconnectedness of nature and our interdependence.  In the alchemical tradition, this is related to the phrase "as above, so below".  Each is a reflection of the other, reminding us that we are all connected.