1. Symmetric pattern: Fold the paper in half, draw half of the pattern you want (such as butterfly, flower, rabbit, big tree ...) on this side of the polyline, and then cut it out. You can also nail its center (butterfly pattern is the best) to a pencil and wave it up and down to "fly".

2. Stretching (lace or bidirectional continuity): Fold the paper in half for many times, draw the pattern you want on the folded paper, and pay attention to the connection of dotted lines on both sides. After cutting, spread it out and get a regular pattern. You can also stick it on the beverage bottle, which will look better.