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Pupils get larger when it is darker - that much you might already know. But they also grow larger when you see or think about things that excite you. That’s the basis of the following eye tricks.

1. Train your pupils. Look in a mirror and think about someone or something that excites you. If you visualize well, your pupils should get larger almost immediately. Practice a bit and you can enlarge you pupils at will.

2. Read minds. Describe to a friend (in detail) several scenes he or she might like, such as a day at the beach, a pretty woman, or a tasty meal. you may be able to see their pupils get larger at times, indicating which scenes are more interesting to them.