Simmel described blasé attitude as an intellectualized approach to life. He claimed that in an urban environment, we have to shield ourselves from stimuli and disruptions. In order to this, we must adapt what he calls a blasé attitude, which allows us to dull, or emotionally gray certain stimuli. It protects us from becoming too overwhelmed.
This picture is of a girl walking alone through a city. It illustrates someone adapting a blasé attitude; eliminating or dulling all other stimuli in order to experience just one. By dulling the people around her she can take in the city structure itself. This becomes a literal, external representation of what she is experiencing internally.