A crystal tower can be 6 or 8 sided with a flat base for it to stand. Towers can be carved and polished into this shape or they can be made from a natural crystal point like Quartz, Amethyst, or Citrine by cutting the bottom to be flat so it can stand. Sometimes the crystal faces will be polished to sharpen, repair, or emphasize the termination.
The energy of a crystal tower is directed upward and out. Wherever they are placed they emit a very focused and directional energy that affects the area around it as well as any other crystals that are nearby.