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In visual communication media, various symbols and logo marks are often presented to viewers as plane figures. It has been recently reported that the perception of plane figures is affected by the psychological influence depending on the layout angles in the field of vision. The subjective geometric relationships of figures are also different from their objective relationships. In our previous research, we examined the relationship between the apparent size of a basic geometric form and its layout angle. When vertices of a square were close to the vertical or horizontal lines, the apparent size of the square seemed to be larger than that of the other layout angles. In this paper, we study how changing the layout angle influences the apparent sizes of various geometric forms and their seeming proportions. Our results show that there are some regular features of the relationship between apparent size and layout angle.

The Effect of Variation of the Layout Angle of Plane Figures on their Apparent Sizes for Rectangles with Different Proportions