Daniel Hulme wrote:
>>Doesn't that constitute confusion, even if the confusion itself is 
>>completely expected?  If there is no valid cross product, and the 
>>look_at isn't working as expected, the end result will be the software
>>not knowing exactly what to do, i.e. being confused.
> 
> If the software is given invalid input, it is the user that is confused.

Very well said.  In future versions the software will attempt to warn the 
user that he/she is confused.

	Thorsten

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