People can be made to see things which are not present or not to see objects in front of them. The experience produced in this manner may not be identical in kind with that of the ordinary waking state, but its realism is surely comparable to the realism of dreams. Thus, the sun will shine at night for the subject, and stars will be visible while the eyes are closed. The hallucinations resulting from hypnotic suggestion are even more convincing when the subject moves about. Then he behaves as if he actually saw things which are not there or as if he did not see objects before him, depending on the suggestion. In one experiment, for instance, a man was made "to walk into the wall from which he sustained a nose bleed when told to walk through an imaginary door in the wall."
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