For many years psychologists have been concerned with the concept of imagery, but few have been able to agree on a definition [1]. According to Pylyshin, mental images are at best subjective epiphenomena that play little or no functional role in significant processes of human thought [2]. On the other hand, Shepard cites many instances where people used imagery [3]. One such example was Albert Einstein who “…very rarely thought in words at all …” [4, p. 184], and that his “…particular ability did not lie in mathematical calculation either, rather in visualizing effects, consequences and possibilities” [5, p. 110]. This example may be anecdotal, but it suggests that psychologists run the risk of missing something very important about human thinking if they believe that visual imagery holds no significant place in cognitive processing.