Can you spot the postcard designed by a famous artist?
Londoners are buying special postcards at random hoping to making a small fortune. The cards are painted by famous names from all walks of life but, you will only know who designed yours, once you have purchased it and turned it over.
Here's is a small selection of the postcards up for purchase at the Royal College of Arts Battersea campus.
All are being displayed anonymously, with the name of the artist written on the back of each postcard meaning it will be revealed only after the sale.
They are on sale for £45 each but, determined art-lovers have been camping on pavements for days in the hope that postcard works by leading artists will earn them thousands.
The diminutive artworks by the likes of David Bailey and Paula Rego are being exhibited at the Royal College of Arts Battersea campus, where dozens of collectors have pitched tents to be near the front of the queue for Saturdays annual secret sale.
Paintings, drawings and sculptures by figures including director Mike Leigh, fashion designers Sir Paul Smith, Orla Kiely, and Sir James Dyson are included in the RCA Secret Postcard show and feature alongside thousands of similar-sized creations by RCA students.
All are being displayed anonymously, with the name of the artist written on the back of each postcard meaning it will be revealed only after the sale.
Most collectors wont know whose work theyve chosen until after they hand over their cash, the shows curator said.