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Welk-the dark colorations indicates that this Welk is a male since the femailes have a lighter colorations. Unlike most shells Welks have a left handed apature/opening.
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.