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What is the colour of the outline - blue or red?, Viral News, Times Now
12 fascinating optical illusions show how color can trick the eye - The Washington Post
These cubes aren't moving : r/gifs
A Century-Old Optical Illusion: Can you Spot an Old Woman & a Young Girl in 20 secs?
How We See Color American Museum of Natural History
The Power of Afterimages in the Mind
This legs optical illusion is causing a new 'blue and black dress' style debate - what do you see? - Irish Mirror Online
This optical illusion transforms a negative image into full colour - but can you see it?
Does everyone see colors differently? Is there a way to tell and how do we name a color? - Quora
Why do People see Different things in Optical Illusions and Why do they see it Differently? By: Molly D and Joey - What's going on in Mr. Solarz' Class?
Why you should always question your perceptions