The Decayed Theory of Poppy Plankton is a 2625 years old piece made by Poppy Plankton, a philosopher living in Marseilles.
Considering its age and the quality of the work, people consider it of no value.
It is engraved with european patterns and some symbols pertaining to Jainism.
This piece doesn't exist, but as a legend. It is said that in the year -256, Yasmin Plankton, the owner, made use of it in Jerusalem to empower the Plankton family. Now it is lost, or broken, we will never know.