Abstract
A series of 8 experiments with O''s of from 10 to 30 was conducted in a study of the following question: What is the relative effect of retinal vs. environmental orientation of a figure upon its recognition by an observer ? Both geometrical and ambiguous forms were examined. Results indicate that when the 2 orientations are brought into opposition, they may so balance each other that the choice of the one or the other is a chance, matter. In other instances where one determinant is more effective, it is probable that the advantage is not so great that it can override chance factors completely.

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