There are a lot of man-made plastic waste or Styrofoam in today's life, which are waste that is difficult to decompose and harmful to the environment. The idea of this course is to collect a large number of dented or broken table tennis balls in the school, as well as pine cones readily available in the natural environment of Kinmen. It uses the relevant knowledge learned in visual arts and hand sewing skills in the field of home economics to allow students to Create your own "Pine Cone Elf", and those table tennis balls that can no longer be used have become special display sketches, transforming the original waste into different values.