Origami sheet - Frog Base

Step 1.

Make a preliminary base, lay it flat on the table, with the closed tip pointing at 12 o'clock.

Step 2.

Form a valley fold, diagonal, by bringing from right to left the upper right edge of the right front flap along the vertical axis of symmetry.

Crease well, unfold, then turn the valley fold into a mountain fold, then unfold.

Step 3.

Lift the right front flap vertically.

Slide the index and middle fingers side by side between the two layers (inside the triangular pocket to open it).

Spread the fingers to flatten the pocket, using the folds made in the previous step.

additional information

We have just made a squash fold.
The double-thickness triangular pocket facing the ceiling has become a quadrilateral on the horizontal plane, symmetrical with respect to the vertical axis of the fold.
The first layer of this quadrilateral is an isosceles triangle with a horizontal base.
The second layer consists of two right triangles side by side, whose hypotenuses form a slit along the vertical axis of symmetry.
There is a long sharp tip glued to the fold, pointing upwards, and two short tips pointing downwards.

Step 4.

Turn the model over from right to left.

Step 5.

Repeat the manipulations described in steps 2 and 3.

additional information

The fold is a symmetrical shape with 6 flaps:
A small front left flap,
A middle left flap,
A small rear left flap,
A small front right flap,
A middle right flap,
A small rear right flap.

Step 6.

Rotate the small front left flap, from left to right, around the vertical axis of symmetry.

Step 7.

Rotate the front left flap, from left to right, around the vertical axis of symmetry.

additional information

At this stage, there is only one left flap remaining.

Step 8.

Repeat the manipulations described in steps 2 and 3.

additional information

Now there are 2 small left flaps and 5 right flaps.

Step 9.

Turn the model over from right to left.

Step 10.

Rotate the small front left flap, from left to right, around the vertical axis of symmetry.

Step 11.

Turn the front left flap from left to right around the vertical axis of symmetry.

Step 12.

Repeat the manipulations described in steps 2 and 3.

additional information

You obtain a kite-shaped fold with:
a long closed tip pointing upwards.
a shorter tip pointing downwards, formed of 4 small free tips, arranged 2 by 2 around the vertical axis.
on the left and right of the vertical axis, 4 double-thickness triangular flaps, which overlap.
Creating four petal folds:
The front face of the fold is a front triangle to which two triangles (one left and one right) are attached by two hinge edges, part of which is hidden (by the front triangle) and part of which is visible (the part below the lower edge of the front triangle). The whole forms a quadrilateral symmetrical along the central vertical axis. There is a long sharp point at the top and a short point at the bottom.
A vertical slit continuing the height of the front triangle splits the short point into two triangles.

Step 13.

Make a valley fold by bringing from right to left the lower right edge of the right front flap along the vertical slit.

Crease well, then unfold.

Step 14.

Form a valley fold by bringing from left to right the lower left edge of the left front flap along the vertical slit.

Crease well, then unfold.

Step 15.

Slide a finger under the lower horizontal edge of the front triangle, then fold it upwards, making sure that a 45° fold forms on each side flap, so as to obtain a short upward point.

additional information

Note that with this movement, the left and right points of the shape have spontaneously lifted, and the two oblique valley folds starting from the second layer of the lower point have spontaneously slightly folded.
At the same time, with the other hand, continue folding the lower valley diagonal folds, bring the side points back to the central vertical axis, and flatten the upper diagonal folds that form on either side of the newly created point.
Carefully mark all the folds.