Part 11. The sink fold

A sink fold is made when the centre of the paper is folded inside the rest of the model. You may have to unfold some of the model to accomplish this. Once you have made the fold, everything usually pops back into place. A thick arrow usually shows you where to push with your finger. This can sometimes be very difficult, so don't be afraid to unfold as much of the model as you need to.
This is one version of how to fold a Pajarita, a traditional Spanish model sometimes called a Hobby-horse in the West. It starts by using a waterbomb base. The sink in step 2 is good practise to learn how to sink fold. A tricky outside reverse fold is required in step 8.
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