When a person is lucky, he or she will look good, and the color of his or her hands also appears to be healthier. Likewise, his or her palm lines appear clearer, giving an impression of being clear-minded and rational. If a person's palm lines are complex, intuitively it means this person has complicated thoughts, and indeed it is true in most cases. Therefore, judging people by their appearances tallies with natural phenomena, and this is the basic principle of "palm" prediction.