Lots of people who take up Tai Chi and Chi Kung get obsessed with learning forms without understanding the basic principles and concepts behind the forms they have already learned. This is why sometimes a form looks like a dance with absolutely no intention or energy behind it.
I like to make sure that everyone at least knows the basic principles and concepts behind what they are learning and hopefully put these into the form they are practising. Sword form particularly needs this understanding or it just looks like someone waving a piece of wood (if you are using a practise sword) around.
Chi Kung is the same - you must have intention (Yi) in the movements so that your energy (Chi) can flow (no Yi no Chi!!!) - yes, you have to be relaxed but also the intention behind the movement has to be there (a bit of a paradox really).
I was once told by a teacher that when you see someone practising Tai Chi it should look like a spiritual person who shouldn't be messed with - I think this sums it up quite well!!!