Looking at this picture is a little like gazing upon a work of art. What does it represent? Who put it together? It's colorful and easy on the eye, especially with the black background that allows all the details to stand out. Regrettably, it's nothing like as pretty as it appears.
With the exception of the shells which are there naturally, this is all regurgitated debris from the ocean. The one thing they all have in common is the tell-tale signatures of animals which have tried to consume them. They're all either chewed or partially digested, but then dispersed back to the land by the tide after the animals have either spat them out or died in the attempt to consume them. It's a reminder that the smallest and most insignificant piece of waste is enough to choke a sea creature if it's disposed of carelessly.