>> They *can* be different, but no mathematical law that says they must 
>> be. (However, ES seems to implement it this way.)
> 
> In the way ES works, the loop is "rotating". The morph is interpolating 
> sheep A to sheep B and *also* rotating. If you play it backwards, it 
> would be rotating backwards, and the sudden jump in "direction" is 
> really noticeable.

I see. So there's a discontinuity in the 1st derivative then? ;-)

-- 
http://blog.orphi.me.uk/
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