Probably more to do with the NeXTSTEP/OPENSTEP ancestry. Those used Display 
Postscript with the origin being the bottom left.

Gerd

On Sep 23, 2013, at 1:19 PM, Dave <d...@looktowindward.com> wrote:

> 
> On 23 Sep 2013, at 17:09, Peter Teeson <ptee...@icloud.com> wrote:
>> 
>> Peter
>> 
>> PS: If my memory is correct, from the beginning of Mac OS up till OS X the 
>> origin was top left.
> 
> Yes, Quartz changed it to be bottom left for some crazy reason - maybe just 
> to be different and upset off the Carbon developers of the day!
> 
> Dave
> 
> 
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