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 Document Folder
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Instructions
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Start with a rectangular piece of paper: A4 is a good size to start
with.

1. Fold in half on the long side, crease and reopen.

2. Fold in quarters, crease and reopen.

3. Fold down the top and bottom edges a bit: this will be the width of
   the spine and for A4 paper 1.5 cm is a good amount.

4. Fold down the four corners to touch the quarter creases.

5. Fold down the top and bottom edges, following the quarter creases.

6. Mountain fold the side edges; turn over the model.

7. Insert the left side in the triangular flaps of the right side.

8. Fold in half on the remaining crease.

9. Turn conterclockwise 90°, done.

Paper size suggestions
======================

A4 with 1.5 cm fold: good for A8 paper and 85 mm * 54 mm business cards.

60 × 40 with 4 cm fold: suitable for A6 paper.

50 cm x 70 cm with 4 cm fold: suitable for A5 paper.