Sand sculpture, like any other kind of sculptures can be of any shape, size or form. It can include the above things- a castle, or created in a human, animal, plant or a fantasy form.
As this art was not evolved from many years, it didn`t have any historical references. Although not historically proved, the origin of this art is found in the Orissan myths.
Sometimes even coloured sand is also used to create sculpture, as in Luilang of China. In making sand sculptures, the goal was to create structures that appear as an artistic example.