# ADSactly Mystery: When the skies were green
If it doesn’t have a name, does something really exist? No, this is not a philosophical post, but an attempt to understand one of the mysteries of ancient times - did our long-forgotten ancestors see the color blue or not? For all of us today, the question seems rather nonsensical - why wouldn’t they see the color blue, there’s plenty of blue around us. Actually, the dress I’m wearing as I write this is blue.
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