It also helps to have a candle near by to cast shadows and reflections. This is a very useful technique to open your subconscious. The objective is to clear your mind, and allow yourself to receive pictures from the crystal ball. Most see a cloudy smoke in the beginning. Then you may see colors, shapes or actual scenes as if watching a movie.
Pendulums are also a great practice that anyone can utilize.
These crystals hang from a chain or string and sway back and forth. It is common to place the wedding band of a pregnant woman on a ribbon. Then the ring is held above her stomach and according to folklore the pendulum predicts the sex of her child. This is a ritual feast for the dead, and a great way to honor our ancestors. A place for all who will eat at the table is set, and also a place is set in honor of the departed.