One of the cows does not have one leg, looking briefly you may not notice.
This I wanted to show, with our eyes we quickly considered the picture "blue cows on an orange background." And the fact that one cow is not like everyone else, you notice later.
We are all part of a common and single whole. But for simplicity of perception, we generalize others under one pattern. For us, the society of other people is like a herd of identical blue cows. But there is one special cow in this herd. And so everyone thinks to himself that he is special and unique, and yet it is still part of a herd of the same cows, albeit with no legs.
It displays the idea that everyone considers himself unique, but for the other person he is part of the crowd.