Step 1:
Take a paper of about 20x30 centimeters.
Fold over this line.

Step 6:
Fold both edges to the centerline.

Step 5:
Fold to the centerline and unfold the model.

Step 2:
Prefold in half over these two lines.

Step 4:
Fold to the centerline.

Step 3:
Fold the edges to the centerline.

Step 10:
Prefold.

Step 8:
Make sharper prefolded lines here.

Step 9:
Prefold, the upper line is in the middle of two prefolded lines.

Step 7:
Fold to the centerline and unfold the model.

Step 16:
Fold over this line

Step 15:
Press the upper part flat.

Step 12:
Turn the model.

Step 11:
This is the other side of the paper.
Fold over the left line and fold the four edges to the right, use glue or tape.

Step 14:
Glue / tape the edges together

Step 13:
Fold the edges against each other, all lines are prefolded

Step 21:
Glue / tape both ends together.

Step 19:
Fold / press this edge downwards.

Step 20:
And fold / press this edge downwards too.

Step 18:
Fold / press this edge downwards.

Step 17:
Fold / press this edge downwards, all lines are prefolded.

Step 22:
Fold this corner downwards

Step 24:
Make sharp folding lines on the bottom of the vase.

Step 23:
Fold the other three corners downwards too.