String provides a very rope-like effect.Array operations are used thoughout
for simplicity and speed and many of the variables can be fiddled with for
different effects.These include 'I' (the number of sections in the piece
of string),'s' (the size of each section),'g' (gravity),'d' (drag:0=thick
string,1=thin string) and w (wobbliness!).This last value can range from 0
(very stiff) to 1('very wobbly and werid' says Tim).

Thanks to Tim Jones for providing this program.