A primary school art teacher used chalk to draw some incredible landscapes on a blackboard in northern China.br br The impressive video, shot in Xinzhou city in Shanxi province on March 20, shows the 30-year-old teacher named Zhao Wenrui drawing some colourful landscapes on a blackboard with chalk.br br Zhao is an art teacher in Bin He Primary School. He said chalk can form a variety of drawing styles in a short time.br br It took him around two weeks to finish one chalk drawing, reports said.