Variety is shown in this picture with the different types of sea shells. The different lines and colors of the shells also add the the principle of variety. Each shell is placed differently in the way that it is set up making each shell different but also creating a sense of unity.
A close up of the top of a sea shell shows the intricate layering of the way the off white shell was formed. The layers of the shell almost appear star like and each layer rotates slightly more that the previous layer, each layer becoming smaller than the layer before it.