Origami Document folder instructions

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+Document Folder
+===============
+
+.. .. figure:: document_folder.jpg
+   :align: center
+
+.. only:: html
+
+   .. contents::
+
+This is a practical and useful document folder with a lot of pockets.
+
+The model is not mine, but I've found it somewhere on the internet in
+the early 2000s and can't find the original source. I've drawn and
+written the instructions from scratch by looking at a model I had folded
+back then.
+
+Materials
+---------
+
+You will need a rectangular sheet of paper.
+
+The size of the fold at step 3 will be size of the spine, and will also
+regulate how much overlap there will be at step 7 to hold the folder
+together.
+
+Some size suggestions:
+
+* A4 paper with 1.5 cm fold: good for A8 paper and 85 mm * 54 mm
+  business cards;
+
+* 60 cm × 40 cm with 4 cm fold: suitable for A6 paper;
+
+* 50 cm x 70 cm with 4 cm fold: suitable for A5 paper.
+
+Instructions
+------------
+
+.. figure:: document_folder_origami.svg
+   :align: center
+
+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.
+
+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.
+