Journal title  RICERCHE DI PSICOLOGIA  
                Author/s Bruno Vicario Giovanni 
                    Publishing Year 2012                 Issue 2010/2  
                Language Italian Pages 18 P. 274-290 File size 554 KB 
                DOI 10.3280/RIP2010-002006 
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A square appears deformed when we superimpose to it diverging rays (illustration 3.1); consequently, to the rays is ascribed the cause of deformation. But if we substitute a scalene triangle or a shapeless object for the square, no deformation is perceived (illustrations 3.3 and 3.4). The fact challenges the concept of "form£ in visual perception. Some considerations follow on the concepts of "good form" and "Pragnanz", pointing out problematic aspects of them. 25 figures are added, 21 of which historical in their original form.
Bruno Vicario Giovanni, Illusioni ottico-geometriche, XV: il problema della forma in "RICERCHE DI PSICOLOGIA " 2/2010, pp 274-290, DOI: 10.3280/RIP2010-002006