"art desolate..."See in text(Ode on a Grecian Urn)
The urn itself is a symbol of both life and death: life in the timelessness of its art and death in the intended use of the urn (ashes). By presenting images of joy and sacrifice on the urn, Keats tells the reader we can’t have joy without despair, we can’t have life without death, and the immortality of art means it must withstand both forever.