There has been a great deal of work trying to find evidence of motifs and compositions derived from entoptic phenomena in prehistoric art, especially rock art and megalithic art. The justification of this research is that entoptic phenomena normally occur during states of altered consciousness, the practice of which may affect our views of ancient religious and social practice. The importance of looking outside traditional methods of research for interpreting prehistoric cultures is made more so due to the lack of abundant data which makes current cultural studies viable. "Art and the ability to comprehend it are more dependent on kinds of mental imagery and the ability to manipulate mental images than on intelligence."