having the letter a as the tea pot is more interesting than just putting a picture of a tea pot in the middle. Tea - Pouring from such a great height is only for the most reckless of tea drinkers. Or for those with plastic topped table cloths.
The poster comments on the subject (racism) in a non-direct way, trying to invoke the reader visually into the inevitable conclusion. It has multiple reads, that provoke critical thinking and raise awareness on the subject and its results globally.