Air, earth, fire, and water are the four basic elements (sometimes known as "temperaments"). Grounding, the base of life, substance, connection to one's life path, and family origins are all represented by Earth. Fire is a symbol of energy, a transformational instrument, a link to personal power, and inner fortitude. Cork is the outer bark of the Oak Tree that is stripped by hand! Oak trees regenerate their bark by absorbing five times more Carbon Dioxide than an oak tree that hasn't been harvested.