The name is again chosen from the model, that based on this base. To fold it, at the first stage we shall mark vertically middle of the square, which, then, we shall use through one stage. On the second step we shall make the book base, then we shall fold the left and right parts to the middle of square.

Now we came to the difficult stage: let's takes the top sheets of a paper, and opens them, then squash so that to receive the complete model.

On this base form are based the following classical models: the house and the piano.