Let's begin from the triangle base form. Let's fold the two sharp corners to the direct. In result we have received the model, which I am declined to consider as the base form. Only from the classical models, submitted on the given site, four begin by this way. Besides the given model there is the bishop hat, the turtle and the lily.

Let's lift triangles upward and turn aside. Then we shall turn upward one layer in front and simply we shall lift one layer behind.