Why do fortune tellers draw symbols?

This is superstition. You don't need an amulet. The spell was spoken. Fish followed the dragon to the sea. Straight water is not supernormal water, but bone water, which ossifies into small bones and ossifies into boneless ones.

All the activities of wizards, fortune tellers, geomancers who have feudal superstitious thoughts and behaviors, as well as those who generally have feudal superstitious thoughts, are feudal superstitious activities, including drawing lots, divination, fortune-telling, reading characters, inviting gods, exorcising ghosts, watching geomantic omen, treating diseases with water, etc.

Extended data:

The scientific method requires seeking truth from facts. Seeking truth from facts, we must be able to discard the false and retain the true, which is not easy, because there are deliberate forgeries, such as creating false images and spreading false information. Another reason is that you don't have materialistic epistemology, scientific methods and basic scientific knowledge, and you have preconceived prejudices, so it is easy to believe that the performance has not been strictly proved.

Because people are influenced by images and imagination stored in their brains when recognizing images, the speed of recognition is limited, and they can't always make correct judgments based on what they see. Hearing is false, but seeing is not necessarily true. The internal causes of many phenomena need scientific analysis and reasoning to make a correct judgment.