Drawing Conundrums
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That was fast Gilles
I can imagine some hair pulling going on in the background with TIG's envelopes
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TIG's is not possible if you want the fourth triangle, too. It is for the three of them.
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I'm stuck with the extra lap.I'll give it a try later.
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I know it's not possible with 4 flaps !
You'll always have a line left over that requires a re-trace!
I was being cruel
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Here's the "5 rooms puzzle"
The object of the puzzle is to draw a continuous [flat 2d] line that intersects each "wall" of the diagram only once. 
This example fails as the wall marked with the O is not intersected...Officially it's "unsolvable"... but there is a tricky solution [that doesn't involve 3d or wormholes!]
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Spelling Conondrum.
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Cooldn't resist -
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I showed you that one when I was in Hungary
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Nope. And anyway, how could you remember?
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After all, this is a 3D application forum!
(The alignment could be nicer though...
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I should have just burned them.
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Here's the solution to the 5-room-puzzle...
It relies on the interpretation that you can intersect a line [wall] at its very end point, thereby allowing you to intersect three at once... -
Mmmmmm ...... 'end point'
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Un peu tiré par les cheveux...
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Ah, so the single line is allowed a thickness, nice.
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I think the bigger conundrum to those rooms is how does one get in?
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