If we put our hands too tight around the globe, terrible things can happen. Fortunately, when we let go, nature finds it’s way back.
The copperball is filled with inked acetone, wich expands very much when temperature rises. The warmth of hands is enough to build up pressure, that pushes the black liquid through the transparent tube. After removing hands the acetone slowly cools down, contracts and withdraws back into the „earth“.