Origami sheet - Frog Base

Step 1.

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

Step 2.

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

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

Step 3.

Lift the right front flap to a vertical position.

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 flattened fold.
The double-layered triangular pocket facing the ceiling has become a quadrilateral on the horizontal plane, symmetrical with respect to the vertical symmetry 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 symmetry axis.
There is a long sharp point glued to the fold, pointing upwards, and two short points pointing downwards.

Step 4.

Turn the fold from right to left.

Step 5.

Repeat the manipulations described in steps 2 and 3.

additional information

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

Step 6.

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

Step 7.

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

additional information

at this stage, only one left flap remains.

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 folding from right to left.

Step 10.

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

Step 11.

Rotate 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 get a kite-shaped fold with:
an elongated closed tip pointing upward.
a shorter tip pointing downward, made of 4 small free tips, arranged 2 by 2 around the vertical axis.
on the left and right of the vertical axis, there are 4 double-layered triangular flaps that overlap.
Making 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, with part hidden (by the front triangle) and part visible (the part below the lower edge of the front triangle). The whole forms a quadrilateral symmetrical relative to the vertical middle axis. There is a long sharp point upwards and a short point downwards.
A vertical slit extending from 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.

Mark the fold well, then unfold.

Step 14.

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

Mark the fold 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 folded slightly.
At the same time, with the other hand, continue folding the lower oblique valley folds, bring the side points back to the central vertical axis, and flatten the upper oblique folds that form on either side of the newly created point.
Carefully crease all the folds.