The text of the I Ching is a set of oracular statements represented by 64 sets of six lines each called hexagrams . Each hexagram is a figure composed of six stacked horizontal lines , each line is either Yang (an unbroken, or solid line), or Yin (broken, an open line with a gap in the center). With six such lines stacked from bottom to top there are 26 or 64 possible combinations, and thus 64 hexagrams represented.