I see some of you had trouble seeing the illusory colors in our latest optical illusion animation. At first I was puzzled why some of you have trouble seeing the illusion, while it worked flawlessly for the others. Then I noticed (by accident) how some browsers and computers (or mobile configurations) play the attached gif animations slower than others. I believe this is the reason why it didn’t work for everyone! The spinner needs to spin very fast in order for you to see the illusory colors. Luckily user called Jo attached the YouTube video inside one of his comment, where you can see how the illusion should behave under the normal circumstances.