Optical illusions can involve color, light, and patterns to create deceptive or misleading images. They occur when your eyes and brain struggle to agree on what they perceive. There are three types of optical illusions:
- literal illusions
- Physiological illusions
- Cognitive delusions
The most widely recognized optical illusion is the mesmerizing phenomenon of a rainbow, which we perceive as an enchanting arc of colors rather than a tangible object suspended in the sky. The rainbow's appearance depends on the observer's position, the light source (Sun), and the horizon. This captivating display arises from the complex processes of reflection and refraction of light, both of which intricately alter the direction of light waves, creating the vibrant spectrum that captivates our imagination.
Another famous illusion that gained attention about ten years ago was the debate over the color of "the dress." Some people believed the dress to be blue and black, while others perceived the dress to be white and gold.
The explanation for these differing perceptions lies in the original image being overexposed, which made the illumination source uncertain. People made assumptions about how the dress was lit, affecting their perception of the colors. If someone mentally removes the blue shadows, the dress appears in bright colors—the white and gold dress. However, since artificial light tends to have a yellowish tint, then some people view the image under this type of lighting, these colors are filtered out, and the dress appears blue and black in the image.
Sources:
www.nationalgeographic.org
www.theguardian.com
www.nyu.edu
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