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Um... Well, with IK sometimes for very organic and complex forms only some of the bones in the chain may need to be constrained. Some could be free of IK like the outer ones and leave IK up to maybe 1/3rd the length of each tendril with limited ball joints like Grendel suggested. That would at least help you be able to set it up or make it turn whatever way you wanted without it wrapping up like a pretzel. All that said, this looks like a perfect candidate for NLA testing because you could make each tendril it's own animation group and animate it independantly of all the others and then blend it all together without any of the "keyframe crunch" that you get otherwise. Carrara can interpolate the NLA without it looking like a mime doing the robot if you know what I mean. That's a job for C6 though, well worth the upgrade for stuff like this..
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