Notice anything strange at Wimbledon this year? Take a closer look.... The tournament's hosting the world's first microtising campaign - tiny adverts on the body and clothing of British tennis player Anne Keothavong. The fact they're hard to see is all part of the stunt. The campaign's promoting Sony's new 4K technology - four times the resolution of standard HD. If you don't have the technology, you can't see the adverts.