Optical illusion – the Blue and Black Dress (or the white and gold dress?)
You may find this surprising but to some crazy people, the dress above appears to be black and blue. To
What causes the breathtaking bluish turquoise color of the Rio Celeste river?
The Rio Celeste is one of Costa Rica’s most spectacular rivers. Its breathtaking light bluish turquoise color is wonderfully unique making
The color wheel
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