Click on the sparkling area to open a hidden object game and find the HORSESHOE.

波光粼粼的区域点击打开一个隐藏对象的游戏，并找到马蹄。

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The mysterious world of art opens its doors for you in downloadable hidden object game.

艺术的神秘世界中为你打开隐藏对象的游戏下载了大门。

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Use your Hidden Object talents to carefully dissect scenes and piece together perplexing puzzles!

解谜天才来仔细解剖的场景和拼凑诡谲的拼图！

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Cloaking relies on guiding light waves such that waves from a hidden object do not reach the eye.

BBC: Invisibility cloaking benefits from crystal-clear idea

Until now, these have relied on what are known as "metamaterials" - artificially-produced materials that have microscopic variations in their properties that guide incoming light waves around or over a hidden object.

BBC: Invisibility cloaking benefits from crystal-clear idea

The BBC and others noted, for example, when a flat region was hidden under a "carpet", when the carpet hid a 3D object, and when the carpet was dispensed with and a 3D object was hidden in "free space".

BBC: Invisibility cloaks: Will we ever really have them?