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Related Experiment Video

Updated: Jun 12, 2026

An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions

An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions

Published on: June 18, 2020

The jaggy diamonds illusion.

Takahiro Kawabe¹, Kun Qian, Yuki Yamada

¹Kyushu University, 6-19-1, Hakozaki, Higashi-ku, Fukuoka 812 8581, Japan. tkawabe@hes.kyushu-u.ac.jp

|June 3, 2010

Summary

A new visual illusion, the jaggy diamonds illusion, makes diamond edges appear jagged. This effect is influenced by orientation, viewing distance, and luminance contrast, disappearing under specific conditions.

Area of Science:

Visual Perception
Optical Illusions
Psychophysics

Background:

Geometric shapes and grid patterns are frequently used to study visual perception.
Illusions can reveal underlying mechanisms of the human visual system.

Purpose of the Study:

To introduce and characterize a novel visual illusion: the jaggy diamonds illusion.
To investigate factors influencing the perception of the jaggy diamonds illusion.

Main Methods:

Presenting diamond shapes at grid intersections to observers.
Systematically varying stimulus orientation, viewing distance, and luminance contrast.
Collecting qualitative and quantitative data on perceived edge jaggedness.

Main Results:

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Last Updated: Jun 12, 2026

An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions

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Published on: June 18, 2020

Creating Virtual-hand and Virtual-face Illusions to Investigate Self-representation

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Published on: March 1, 2017

$Synthesis and Microdiffraction at Extreme Pressures and Temperatures$

Synthesis and Microdiffraction at Extreme Pressures and Temperatures

Published on: October 7, 2013

A new illusion, the jaggy diamonds illusion, was identified where diamond edges appear jagged.
The illusion diminished with 45-degree stimulus rotation, close viewing distances, and direct fixation on the diamond.
Luminance contrast significantly modulated the illusion's strength.

Conclusions:

The jaggy diamonds illusion demonstrates sensitivity to geometric orientation and viewing parameters.
Luminance contrast is a critical factor in the manifestation of this novel visual illusion.
Further research can explore the neural basis of this illusion.