"Rune" <run### [at] mobilixnetdk> wrote :
>
> As always, it difficult to precisely visualize for my inner eye what
> something looks like from a written description, but I can give it a
> try.

    I used to open my blinds just a crack in the early morning and set some
incense under the slit of sunlight that would come through. It allowed me to
study the internal shape of a stream of smoke fairly intently. I will try to
take a photo in the morning but here is a quick mouse sketch of the shape I
mean. This would be a horizontal cross section of the stream.

    I always thought that the shape allowed the smoke to store energy in a
smooth, protected inner spiral which works well as long as there is no
turbulence, but which comes apart completely as soon as one of the shells is
breached.

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