Is that blue or green?

They are the same.
Here is how your brain done this.
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on Sunday, July 19th, 2009 at 5:32 AM and is filed under Fai's sharing.
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Oh, it is ture. When you cover other parts, just leave the green or blue stripe exposing to you, they are the same color. It is amazing. I know sometimes it is difficult to judge the true length of a line or the shape of one subject, for example, when two lines look this ” and >—<”. But it is the first time I know this can happen to the color.