As posted on the Chinese Twitter :
 
UFO飞碟画在非常偏远的小村庄，看起来像一个偏僻的小村庄，荷兰街蓝...或者是一个streetartist的工作吗？ 
 



 

Experts have not found an explanation and are absolutely clueless.
Dr. Prof. Dr.  Lingam: " We have absolutely no idea, why it ignored the stop-sign" 



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