Notice: at first I’ve made these diagrams only for the video, not to be published separately. For this reason, some transitions or steps might not be so clear. If you find some step difficult, you can find more detailed instructions in the video tutorial.
Use a rectangle sheet of paper with ratio 1:2 (half of a square). I recommend 10cm x 20cm). It works best with thin paper because one of the sides will have many layers. Number of steps: 37