3b and 3a are the strongest IMO, despite the mystical ribbon it actually works and carries on a theme from this year, as well as providing an identity.<br><br>I can recognise it is as the opera house but can see how it might be mistaken - perhaps this element can be worked on ? - despite what people may think of the opera house it's architecturally impressive and I think its representation in 3a/b is a little cartoonish and could be improved. <br>
<br>Its simplicity works for me and it could be shaped into an effective logo.<br><br>I'm not sure the combined logo's look very good - they look....combined/merged rather than a single image that represents the conference<br>
<br>Cheers<br><br>Simon<br><br><br><br>