Common fate is one of Gestalt’s principles of organization, which look at design compositions as a whole. This principle suggests that elements that move in the same direction or have similar orientation will be seen as a unified group.
straight lines make one group, slanted form another.
INTERFERENCE EFFECTS
The Stroop Effect is an interference effect that occurs when one is forced to interpret the words in this list as colours based on the hue in which they are written. The brain gets confused because we are taught that what a word reads is more important than its colour.
ORIENTATION SENSITIVITY
Orientation sensitivity has to do with the eye’s interpretation of lines. It’s based on the oblique effect and the pop-out effect.
Oblique effect: the ability that a person has to accurately perceive horizontal and vertical lines better than slanted or oblique lines. This effect is caused by a higher sensitivity in the eye for viewing horizontal and vertical lines. In general, people tend to enjoy designs with distinct vertical and horizontal elements, because of this phenomenal effect.
Pop-out effect: The tendency of specific elements in an image to be seen quickly as more prominent because of their angle on the page. If an image in the foreground differs in angle from the background pattern, it will be more easily detected, and will pop out at the viewer.
Orientation sensitivity is important in design because it is necessary to look at the way things are placed in a composition and know how to make a certain object in a series stand out.
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