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9. Their emotional appeal There are more uses of air cooled heat exchangers, much like the upstream production, refineries and petro-chemical facilities. It can also be employed on situations with good temperature, high pressure, corrosive fluids and environments. Moreover, air coolers could be equipped and employed in oil and coal refineries; compressor stations for gas pipelines; subsurface gas storage facilities; plants producing polychlorvinyl, polyethylene, glass fiber, biplastic; caustic soda plants; by-product coke plants and ammonia transportation and handling plants. Darkness and light are themes that run heavily through Van Gogh's work. Darkness and light reflected his wish create beauty, his feelings of inadequacy, with his fantastic wish to touch the souls in men. For instance, Starry Night draws the viewer in to the painting of an sleeping village with its swirls of light and its rich evening sky.