This poster is so cool! I love any design that uses a picture to modify another to make it more interesting. What this poster also does well is it blends the city and the mans head really well and even the colors are very similar making the poster that much better.
French agency, HELMO, has been producing some of the best design in the past couple of years. I love their understanding of form, color, typography and pattern. I can’t recommend their work more and highly suggest a bookmark and 30 minutes to take in their work.