Sacred geometry is the idea that certain geometric shapes have a symbolic, sacred or spiritual meaning behind them. These sacred shapes have been used throughout history in the construction of religious buildings, temples, and architecture. Going back to ancient times, certain numbers (and the polygons which corresponded to these numbers – e.g. the number three corresponding to the triangle) were also thought to have a symbolic, almost mystical significance. Healing can be facilitated and meditation enhanced by using pyramid energy, platonic solids, crystals and stones, shells, art, etc. in sacred geometric forms.