A selection of pencils decorated by well-known contemporary artists and designers, including Paul Smith and Anish Kapoor, is to cross the block online at Paddle 8 on June 3.
The sale (titled The Secret Life of the Pencil) is being held to benefit Children in Crisis, an educational charity.
The charity's chief executive, Koy Thompson, explains: "It's such a simple tool, but with it comes the chance for each child to reveal their ambitions, their hopes and dreams; to write them into the world instead of keeping them hidden inside.
"In the war-affected countries where we work, places such as Afghanistan and the DR Congo, we know that you can't nurture futures without first sharpening pencils."
Please sign up to our free newsletter to receive exciting news about art and photography auctions.