I remember doing this with business cards some time ago.  Always
confused people until they flattened it back out correctly.

-Adam

On 9/27/06, Russell McMahon <apptech@paradise.net.nz> wrote:
> This superb puzzle / brain teaser can be constructed using a sheet of
> paper and scissors.
> I recommend a sheet of plain white A4 photocopier paper to start with.
> If you have A5 plain white paper or card it's a better size but do
> start with the A4 otherwise. DO NOT use a 6x4 index card or similar
> until you know 'the trick' - you'll understand why in due course.
>
>         http://www.ultralifebatteries.com/newsletter/ultra_brain_power62.html
>
> I strongly recommend  that you try and work out how it's done before
> you look at the answer.
>
> It's not well explained / drawn.
> The paper sheet appears exactly as shown.
> The pivoting flap pivots along a line halfway between the two long
> sides so that the top slot forms one edge of the pivot and the bottom
> slot forms the other. The flap can be folded flat to the left when its
> nearest edge aligns with the nearest edge of the left hand slot, or
> folded flat to the right when its far edge aligns with the far edge of
> the right hand slot. Visually its quite amazing on first sight. It's
> obvious how it works "once you know how".
>
> I saw this done in sheet Aluminium many years ago. I don't recall
> whether I worked out how it was done at the time.
>
>
>
>         Russell
>
>
>
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