Shoppers on one of China's most famous commercial streets are in for a treat this week as the world's longest 3D ground painting has been unveiled to the public on Wangfujing Avenue in Beijing. More ...
A stereogram optical illusion is a fascinating visual puzzle that hides a 3D image within a 2D pattern. At first glance, it appears to be a random collection of repeating designs or colourful dots.
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