Language is identity. This poster express such idea in a very strong and simple way: a symbol of a fingerprint made from speach ballons. The fingerprint represents the very expression of one's identity; it is - like our language - an inseparable part of ourselves.
Speech ballons are a graphic convention to represent oral speech, meanning, in this case, each one's language as a hole. The ballons are organized in a concentric way, which suggests a spreading movement, like the waves provoked by a rock that is thrown in a pound. Therefore, this symbol also conveys the idea of communication and self-expression.
The simplicity of the symbol make it easy to use in different circunstances, without losing it's expressive force.