Stairs

This device cannot show the 3D view. Follow the step pictures and text below instead.

1. 

   1. Fold in half and unfold

   Lay the strip lengthwise, white side up. Fold the right end to the left end and unfold.

2. 

   2. Halve the left half

   Fold the left end to the centre crease and unfold. The left half is now in two parts: the floor and the back wall.

3. 

   3. Divide the right half into four

   Fold the right end to the centre crease and unfold. Then fold the right end to that new crease and unfold, and fold the right part over so the new crease meets the centre crease, and unfold.

4. 

   4. Divide it into eight

   Four more times, fold the right part over so that two neighbouring creases meet, and unfold. The right half now has eight equal panels.

5. 

   5. Pleat it like a fan

   Starting at the first panel of the right half, fold the panels back and forth (valley, mountain, valley…) so they stack up like a fan.

6. 

   6. Stand up the wall

   Leave the left panel (the floor) on the table and fold the next panel up to a right angle: this is the back wall. At the centre crease on top of the wall, fold the pleated stack over toward the floor at a right angle: this is the top step.

7. 

   7. Open out the steps

   Open each pleat to a right angle so treads and risers take turns. When the end of the bottom step rests on the end of the floor, your stairs are done!