Dave 3 wrote:
As you say practise and I suppose confidence is the main thing.I think that because you know how the trick is done when showing it I think that they will also know but of course obviously they dont.
Many of magic routines out there can rely more on the confidence and presentation of the effect than the actual working of the routine themnselves.
It's often easy to think that the sepc will easily spot the secret when you find out how the trick is done and I always remember back to when I was learning the chop cup routine.
I was always amazed by the chop cup routine and know that I just had to learn how to do it. However, when I actually saw the mechanics of the routine I was somewhat taken aback and thought, 'that can't be right, no one will ever be fooled by that' Anyway, I practiced and the moment that I fell head over heels in love with the Chop Cup was when I performed it for the first time and fooled everyone. A always think back to how this was a perfect lesson in how strong even simple misdirection can be and how you can give your confidence a big boost at the same time.
You could even tell someone how you do it and they won't believe you! People are very reluctant to believe that they can be fooled so easily.
There's very little else in magic that comes close to the delight that I get from performing with a chop cup

Member of the Magic Circle & The 2009 British Isles Close-Up Magician of the Year
It's not really an optical illusion - it just looks like one!