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Stone masonry is a construction technique that uses individual stones to build structures and can be categorized into two main types: rubble and ashlar. Rubble masonry uses uneven, naturally shaped stones such as river rocks or fragments from quarries. This method often requires the mason to select and possibly shape each stone to fit the designated space, ensuring a proper build, even with irregular stone sizes and shapes. Ashlar masonry, on the other hand, employs uniformly cut stones that...
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Creating Virtual-hand and Virtual-face Illusions to Investigate Self-representation
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The stone-base illusion.

Songjoo Oh1

  • 1Department of Psychology, College of Social Science, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826 Korea.

Vision Research
|April 27, 2020
PubMed
Summary
This summary is machine-generated.

The unevenness of a stone base influences the perception of a wooden post appearing embedded within it. This visual illusion in traditional Korean architecture is explored through photographic and 3D model experiments.

Keywords:
Edge similarityFigure-ground assignmentPerceptual groupingVisual completion

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Area of Science:

  • Cognitive Psychology
  • Perception Science
  • Architectural Studies

Background:

  • Traditional Korean architecture often uses natural stone bases for wooden posts.
  • A common visual phenomenon is the illusory perception of posts being embedded in their stone bases.

Purpose of the Study:

  • To investigate the factors influencing the perceived embedment of wooden posts in stone bases.
  • To determine if the unevenness of the stone base affects this visual illusion.

Main Methods:

  • Experiment 1: Presented photographs of real stone bases and wooden posts.
  • Experiment 2: Utilized 3D graphic models of stone bases and posts with controlled visual properties.
  • Participants judged the degree of perceived embedment in both experiments.

Main Results:

  • Increased unevenness of the stone base led to a stronger perception of the post being embedded.
  • This effect was consistent across both photographic and 3D model stimuli.
  • The findings suggest that visual cues related to surface irregularity significantly impact perceived depth and integration.

Conclusions:

  • The unevenness of the stone base is a key factor in the illusory visual completion of post embedment.
  • Potential explanations include principles of figural goodness, edge similarity, and the influence of physical knowledge on perception.
  • Understanding these perceptual mechanisms can inform architectural design and the study of visual illusions.