Wasn't it Warp who wrote:
>Mike Williams <nos### [at] econymdemoncouk> wrote:
>> [1] Which actually might have been a sensible way to have done it in the
>> first place
>
>  Why?

For consistency with things that were invented around the same time
(many of which are not used much these days) like Sphere, Cylinder_X,
Cone_Y, Disk_Z, Cube and more recent things like the torus and
Supertorus which all pop into existence centred around <0,0,0> rather
than <0.5,0.5,0>.

I'd guess that even today only a relatively small percentage of image
maps get used without translate <-0.5,-0.5,0> scale 2.

-- 
Mike Williams
Gentleman of Leisure

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