The best place to put a crystal ball is in an area of your home that you feel most comfortable and relaxed. This could be anywhere from the living room, bedroom, or even a meditation space. It should be placed on a flat surface such as an altar or table so it can be easily seen and accessed when needed. Make sure the crystal ball is not too close to other objects which may interfere with its energy field. Finally, ensure that the light source around it is gentle and soothing - this will help create a peaceful atmosphere for readings.