Sand bar broken

Why Sand Bar? The idea is of an incoming tide and the long time it takes between tides yet the noises and melodious notes are soft the rapidity of any tide advancing must be kept in min. at a point the forces can alter and the (ancient) idea of entrapment for fish, for prey is a law of nature. Allow for changes, alteration but remember you are working with nature. Then an agreement is reached. Tides are a constant and we are not, only visitors. finishes on a good note I think!