Cantril reviews some recent experiments showing how a percept is related to personality. The stereoscope, a promising instrument, presents two differing photographs simultaneously so that a different portrait is presented to each eye. In the final percept, yet another single face is seen. The reported percept varies from subject to subject. The two photographs compete for dominance in an interesting way. The subject's interests largely determine which of the paired photographs will dominate. Other devices such as prisms and mirrors have been helpful in presenting live subjects as paired stimuli. Here too the individual's emotional 'set' determines the final percept. The distorted room method for studying perceptual reactions is also discussed. A study of married couples and children showed that the relationships between the subjects markedly influenced what they saw. These experiments verify analytic discoveries concerning perception and its relation to the ego.