Preparation materials: gourd, transparent pattern sticker, glass sheet, projector, pen and electric soldering iron.

1. First, stick the prepared transparent pattern sticker on the glass sheet, as shown in the figure.

2. After pasting, fix the glass sheet on the projector, as shown in the figure.

3. Place the gourd in front of the projector and adjust the pattern size (the closer to the machine, the smaller the pattern, and the farther away, the larger the pattern).

4. After adjusting the size, confirm whether the lines of the pattern are deformed, if so, adjust them, and ensure that the pattern is clearly projected on the gourd.

5. Draw a pattern along the projection line with a pen.

6. After the pattern is copied, you can brand the pattern on the gourd with an electric soldering iron.