Perfect Sphere to place in your space to encourage the flow of energy. The perfect size to use on larger grids.
 
 
Black Obsidian: A strongly protective stone, it forms a shield against negativity. It blocks psychic attack and absorbs negative energies from the environment. Obsidian draws out mental stress and tension. It stimulates growth on all levels, urging exploration of the unknown and opening new horizons.
 
*Each piece is selected intuitively for you.