Renowned French artist Pierre Duc has created some exceptional "land art" with his collaborator Thierry Gallibour for this year's Tour de France.

His large-scale works incorporate and manipulate natural materials, often stretched across open fields, and are best seen from the air.

Duc is interviewed in Bicycling, saying, "These works are ephemeral, but thanks to the TV and video, they remain in the collective memory and become part of the cultural and artistic heritage."