has any one ever noticed that if u hold a chain at one end and spin it round real fast u get a kind of oval shpere produced but with a tail at the end. the faster you spin the chain the greater the horizontal radius of the 'shpere'. i thought realy hard about this but i cant work it out. atm i think tht the point where the shpere is completed and the tail begins is some kind of node. how can you explain this effect and work out where the 'node' will be produced?