A 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 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.
USES:
• Crystal towers are excellent to use in the center of a grid to focus its intention and energy.
• Feng Sui a room, one example of this would be placing a tower in each corner of a room to create a vortex of energy.
• One of my go-to shapes to grab when I need to calm down and focus is a tower. Meditating holding a tower will allow any blocked or stagnant energy to flow again and help you to reset and feel more energized. You can do this by focusing on the energy you feel in the tower - what is the direction it's flowing? Where can you feel it in your body? Is it cleansing and releasing energy or bringing in new energy, or both? You can try visualizing the energy moving out or into your body, flowing through and clearing each of the chakras from head to toe. 
• A few of my personal favorite ways to use crystal towers is putting them in my workspace, for example, fluorite is especially good for desks or offices due to their ability to aid in focus and concentration, I like to think that the fluorite points on my desk are providing me with sharp and direct energy to help me focus on whatever I’m working on.
• Another way I love to use towers is bringing them in the shower with me. I know it might sound silly, and even risky (you definitely want to be careful!) but I love the energy of a tower to accompany me in the shower. Clear Quartz, Fluorite, and Amethyst are my favorites for this, it just depends if you’re trying to wake up, reset and cleanse, and/or relax and calm down. In addition to the shower, I also love to create grids around my bathtub using towers and other shapes.