Very little and extremely large: Moment the world's smallest man came face-to-knee with the world's tallest man...

The Turkish farm labourer and the pint-sized man from China were happy to pose at an event in Istanbul to mark the opening of the new Guinness World Records Live! Roadshow.

It kicks off six weeks of record-breaking at the Forum Istanbul where members of the public can attempt to smash 50 different records.

Kosen said: 'I've wanted to meet Pingping ever since I was awarded the title "tallest man" and I'm really happy that he was willing to travel to Turkey so we could both take part in the launch celebration of Guinness World Records Live! at Forum Istanbul - I can't wait to show him around our beautiful city.'

(...) Born and raised in the Mardin province of Turkey, Kosen's height is due to a condition known as pituitary gigantism.

After a series of surgeries to remove the tumor which was causing his excess growth, Kosen stopped growing in 2008.

At the opposite end, He PingPing, 21, suffers from a condition known as Primordial Dwarfism.

According to his father, at birth he was small enough to fit into the palm of his parent's hand.

He lives with his family in Inner Mongolia, China and has travelled the world since being recognised by Guinness World Records.