Russell,

On Thu, 28 Sep 2006 02:44:05 +1200, Russell McMahon 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

Sorry Russell, I must have a particularly warped sense of spacial awareness - it took me about 5 seconds to work this out...

> 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.

Indeed - the explanation diagram doesn't make it clear which lines are cuts and which are folds.

> 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 understood it until you explained it!  :-)))
 
Cheers,


Howard Winter
St.Albans, England


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