Take a pen as a prop, roll up the two sides of the post-it note without any trimming, make a cone with a paper chest, take out the cardboard, draw several circles with compasses, and cut it down along the drawing lines on the cardboard. A flower needs two pieces of cardboard, so you can paint the paper chest, combine two different cones together to make a layer, and so on until the flower heart is filled, and a three-dimensional paper is made.