
The Art And Therapeutic Nature Of Patterns
Workshops, Courses & Retreats Exploring The Oneness Of Things
Australia, International and Online Learning with Stephanie June Ellis

Geometry Of Seashells
Geometry Of Seashells
Exploring 4 proportional harmonies inspired from a selection of
seashell formations with a focus on logarithmic spirals using the octagon,
hexagon and the torus spiral.
Class runs for 3 hours
What are seashells and why are they important to the ecosystem?
Seashells are an important part fo the biological and geological process of beach stabilisation and creating important sediment.
They are materials for birds' nests, a home or attachment surface for algae, sea grass, sponges and a host of other microorganisms.
Fish use them to hide from predators, and hermit crabs use them as temporary shelters. The removal of large shells and shell fragments also has the potential to alter the rate of shoreline erosion.
Shells are mostly made from calcium carbonate, and 2% protein.
Unlike typical animal structures, shells are not made up of cells. Mantle tissue that is located under and in contact with the shell secretes proteins and mineral extracellularly to form the shell.
Think of laying down steel (protein) and pouring concrete (mineral) over it.
Thus, seashells grow from the bottom up, or by adding material at the margins.
Since their exoskeleton is not shed, molluscan shells must enlarge to
accommodate body growth.
This pattern of growth results in three distinct shell layers: an outer proteinaceous periosteum (uncalcified), a prismatic layer (calcified) and an inner pearly layer of nacre (calcified).
Sadly, as more trash makes its way to the ocean and coastlines, fewer shells are available for these animals. It is becoming increasingly common to find hermit crabs living in toxic plastic waste such as bottle and toothpaste caps which do not fit their body shape and make for a very uncomfortable and dangerous living. You might think twice next time you snag a seashell from the beach and drop it into your pocket: you might be altering the seaside environment.



















