The experiment on which H. V. Helmholtz based his argument against R. Hering's principle of cyclopean projection was repeated with slight modification. The hypothesis tested was that the role of the cyclopean eye can be demonstrated by measuring sensorimotor adaptation. In 2 experiments with a total of 36 college students, each S aligned his finger to 1 of his eyes and a fixation stimulus on the median plane. In Exp I, results show a change of felt position toward the median plane. In Exp II, results show a shift of apparent visual straight ahead toward the location of the finger and a change in felt position. Results indicate that Helmholtz's argument is unjustified. (PsycINFO Database Record (c) 2006 APA, all rights reserved)