Miura fold

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1. 

   1. Divide into 4 strips

   Lay the A4 sheet sideways, coloured side up. Fold the bottom edge to the top edge and unfold. Fold the bottom edge and then the top edge to the middle crease and unfold. You now have 4 equal strips.

2. 

   2. Pleat into a strip

   Fold the bottom strip up (valley fold), then fold the bottom two strips together behind (mountain fold). Fold the top strip down in front (valley fold). You get a long strip pleated into 4 layers.

3. 

   3. The first slanted fold

   Fold the right end of the strip to the front along a slightly slanted line: 5.1 cm from the end along the bottom edge and 4.2 cm along the top edge.

4. 

   4. Fold back

   Along a line parallel to the first one and 5.1 cm further left, fold everything on the right behind (mountain fold).

5. 

   5. Fold the left end

   From the left end, fold along parallel lines with the same slant, 5.1 cm apart: to the front, behind, then to the front. Press the small thick block hard so every crease is sharp.

6. 

   6. Open everything

   Unfold the strip, then unfold the pleats. The sheet is now covered with slanted parallelograms, and the up-and-down creases form zig-zag lines.

7. 

   7. Set the zig-zag creases

   Pinch the 1st, 3rd and 5th zig-zag lines from the left into mountain folds. Make the 2nd and 4th valley folds (turn the paper over and pinch them as mountains from the back). The sheet turns wavy.

8. 

   8. Squeeze from the sides

   Slowly push the left and right ends toward the middle. The zig-zag lines fold deeper and the straight creases start folding by themselves, switching between mountain and valley at every zig-zag line: a herringbone pattern.

9. 

   9. Press it flat

   Keep squeezing, now also from the top and bottom, until everything lies flat as a small block. The Miura fold is done!

10. 

    10. Pull to open, push to close

    Hold the top-left and bottom-right corners and pull them apart: the whole sheet opens in one motion. Push them back together and it folds up again along the same creases.

11. 

    11. Stop halfway

    Pull just a little and it stays half open. Hold it level to see the herringbone pattern. All the creases move together, so a single pull decides the shape of the whole sheet.