An original piece of artwork by the great Pablo Picasso worth an estimated £675,000 could be yours for as little as £85.L'Homme au Gibus - or Man With Opera Hat - is being put up as a raffle prize to raise money for charity.
It is the first time that work by one of the major painters has ever changed hands in such a way.
Olivier Picasso told Sky News that his grandfather would have loved the idea.
"My grandfather was a pioneer, he was happy to be the first in every kind of situation," he said.
"He was a helpful person, very generous, giving money around him during many difficult times."
Each of the 50,000 raffle tickets costs €100 (£85), and the official draw will take place in Paris on December 18 under the supervision of Sotheby's and a court bailiff.
The €5m raised by the sale of the raffle tickets will help finance preservation projects in the ancient Phoenician city of Tyre in southern Lebanon, which was badly damaged during the Lebanese civil war. It is now a Unesco World Heritage site.
The fundraising project is the initiative of Olivier Picasso and French journalist Peri Cochin, whose Iraqi and Lebanese family have long been involved in protecting Tyre.
She said: "It's a dream. So many people would love to have a Picasso and will never be able to afford it, so it's really a dream that could come true.
"If you win it and you don't want to keep it, of course you can sell it."
Man With Opera Hat - a cubist period piece - goes on display at the 20th century art and design fair PAD London.
Its authenticity has been attested by Picasso's children Maya Picasso and Claude Ruiz-Picasso.
Buy a raffle ticket online