You are looking drowsily at an un- varied herd of black-and-white dairy cows when, suddenly, you discover a purple cow in their midst. Standing out from the crowd, the purple cow is the one you are instantly drawn to.
一大群黑白相間的乳牛，看起來單調、缺乏變化，正當觀者昏昏欲睡時，突然發現當中有一頭「紫牛」，果然叫人眼睛一亮，黑白乳牛群中的「紫牛」也會因與眾不同而大紅大紫。