by Serendipity » Jul 25th, '07, 00:07
I think it depends what you're talking about learning. Anything you do with two hands (like shuffling as a very simple example) is always going to be done with two hands, so there is little point learning the mirror image of every trick.
However, in my opinion certain sleights that are done in one hand are worth learning with both (say, for example, if there was some magical way of concealing a card in the palm of your hand...) This means that should you find yourself in a situation where, whilst performing magic to an enthralled audience member, someone approaches to watch mid-trick, only to stand at the worst possible angle for whatever sleight is needed to complete the effect. If you are able to simply execute the move with the other hand, giving complete cover, then you are in no danger of ruining the magic of the moment.