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Optical Illusions

Can you identify which of the following are optical illusions? What about fake optical illusions?
Warning: There is no guarantee we didn't mess with a famous illusion--you have to rely on your senses!
Using a ruler is cheating!
Quiz by Dimby
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Last updated: June 3, 2024
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First submittedJune 3, 2024
Times taken41
Average score66.7%
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1. Lines with Arrows
Red and Blue are the same length
Red and Blue are different lengths
2. Circle-Dot Illusion
Red and Blue are the same distance from the star
Red and Blue are different distances from the star
3. Flower Illusion
Red and Blue are the same length
Red and Blue are different lengths
4. Circles in Circles
Red and Blue are the same size
Red and Blue are different sizes
5. Triangle and Hypotenuse
Red and Blue are the same length
Red and Blue are different lengths
6. Encircled-Dot Illusion
Red and Blue are the same length
Red and Blue are different lengths
7. Encircled-Dot Illusion
Red and Blue are the same distance from the star
Red and Blue are different distances from the star
Triangle and Hypotenuse
8. Railroad
Red and Blue are the same length
Red and Blue are different lengths
9. Circle-Dot Illusion
Red and Blue are the same distance from the star
Red and Blue are different distances from the star
10. Crescent Illusion
Red and Blue are the same size
Red and Blue are different sizes
11. Fake Shadow Illusion
Red and Blue label the same shade of grey
Red and Blue label different shades of grey
Triangle and Hypotenuse
Sorry, this is a bit of a trick. There is a famous illusion like this, but this one massively exaggerates the colour differences!
12. Gradient Illusion
Red and Blue label the same shade of grey
Red and Blue label different shades of grey
13. Curved Tiles
Red and Blue are the same size
Red and Blue are different sizes
14. Crescent Illusion
Red and Blue are the same size
Red and Blue are different sizes
15. Line-Dot Illusion
Red and Blue are the same distance from the star
Red and Blue are different distances from the star
4 Comments
+2
Level 59
Jun 3, 2024
80% is crazy
+1
Level 78
Jun 3, 2024
Nicely done. I’m curious to see if any of my homemade illusions work.
+2
Level 85
Jun 4, 2024
Great quiz. Missed two - 6 and 15.
+2
Level 65
Jun 7, 2024
Also only missed two- but they were #7 & #9. Added this quiz to my playlist