Your photograph says : Human being is living in the meddle point of the global warming and polluted environment. Left sky is fire red, means- the world is been warm and unstable due to our bad activities ( terrorism, cold war, killing people). Under the bridge, the canal water is looking like polluted water- that means we destroy our environmental eco-system. There is no away to alive us in this world, that's why human being is looking for peace as like as blue color (in your photograph). People wants peace, for this reason man signal to each and other to come blue peace area. we are waiting for peace .