It's pointing out the conflict between two coding ideals - first, reducing duplicate code so that you don't have to reinvent the wheel and/or copy-paste code (which often means making calls to libraries) which is represented by the red penguin facing right, and second, wanting to reduce dependencies so that external variables are reduced (which would mean including code in your codebase that otherwise would be an external library call) which is represented by the blue penguin facing left.

The closer you get towards one ideal, the further away you get from the other.