Modern art made from fifty million-year-old London clay.

Bird Nest, created by east London sculptor Frank Harris. Credit: Crossrail

London clay, thought to be fifty million years old, has been turned into a piece of 21st century art.

Bird Nest, created by east London sculptor Frank Harris, was made using material dug up during the building of the new Crossrail tunnels.

Frank Harris mixed the clay with straw and sand to create the building material, cob. Credit: Crossrail

The piece is exhibiting at the Slade Shows 2013 this week at the University College London.

The unveiling of the unique artwork comes as Crossrail launches its Artist in Residence programme, providing artists the opportunity to use Europe's largest construction project and its workers as their muses to inspire creative art.