Landscape paintings are perhaps the most popular form of Chinese art, both in China and the U.S. Scenes often include high, steep mountains, frequently including waterfalls or rivers. The impressionism of the Lingnan style of Chinese painting is particularly effective in landscapes. Chinese landscapes sometimes include buildings, wooden bridges, and people in the background. Trees populate nearly all Chinese landscapes and may be in the foreground or background. Some paintings are set by the ocean and almost always include rock cliffs or small but steep mountains rising out of the water. Lake scenes will sometimes include a small boat or a person fishing from the bank. Occasionally the Great Wall of China is seen in the background.