cow, bungalow roof, optical illusion. 牛, 平房屋頂, 錯視

Milking it: The two cows seemed to be grazing on top the slated roof in Newton Abbot, in Devon
Newton Abbot photographer takes a picture that appears to show a cow on a bungalow roof | Daily Mail Online
Read more: http://www.dailymail.co.uk/news/article-3498451/Pull-udder-one-Photographer-takes-picture-appears-cow-bungalow-roof.html#ixzz43IMV8M1K
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Optical illusion - Wikipedia, the free encyclopedia

錯視