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I was reading along in a great book called Why Buildings Stand Up [Salvadori] and I came across a cool folded paper arch. When properly supported laterally by buttresses, it can support a couple orders of magnitude above its own weight. It also looks great and can be a hat! Here's how to fold it.

Step 1: Start With a Piece of Paper

Start with a plain 8.5x11. 
Fold into eighths along the long direction.
Then fold 14 diagonals in the opposite direction, using the ends of the first folds as guides.
I made poor creases on the first try (they didn't align with the edges of the first set of creases), but then had much better success using a pencil and a straightedge.


Step 2: Taking Shape

As you complete the diagonal creases, the sheet will begin to curl. 
Finish the barrel by encouraging the folds so that the paper curls into a half-circle.
Eventually, it will fold up accordion style into a flat, rotationally symmetric 2D shape.

Have fun!

Awesome thin shell concrete roof:
<http://lh3.ggpht.com/_sd4aOA0Ur-I/TQXrIzkCJeI/AAAAAAAAO1I/skpM5Ti_0-o/The-Art-of-Structure-Chapel-Lomas-de-Cuernavaca-by-Felix-Candela_thumb%5B2%5D.jpg?imgmax=800>


<p>Which lines should be folded up and which ones should be folded down? </p>
<p>... And why does a rectangular piece of paper turn into a perfect hexagon?</p>
<p>My children will love this. I'm trying it!</p>
I like it. the book sounds good too
This is very useful, you can make a bellows whit this method. I need some like this for my workshop. Thanks for sharing.

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Bio: just getting back into Instructables. Hopefully some better projects to come!
More by danielhfourie:Sewing a Mini Paraglider Paper Folded Barrel Structure How to True a (really wonked) Wheel 
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