Am 14.07.2017 um 16:11 schrieb Bald Eagle:

>> Seems that an odd number of spheres creates a more interesting look than an even
>> number (my opinion, anyway.) Maybe that's because familiar kaleidoscope images
>> are usually of 3,5 or 7 repeated 'segments', and I'm just used to that
>> arrangement.
> 
> Or maybe it's just that you're an odd fellow  ;)
> 
>> A learned response, in other words.
> 
> Or perhaps there's some "organic" neurobiological response that's more
> effectively stimulated with an arrangement of an odd number of objects than an
> even number.

My guess is that it's not really a matter of odd vs. even, but of primes
vs. non-primes. It just so happens that there's only a single even prime.

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