By KERRY MCQUEENEY
Head for heights: Thrillseeking photographer Tom Ryaboi took this shot from the roof of a skyscraper, high above the streets of Toronto
If you're thinking of giving this new photography craze a go, a head for heights is as essential as a camera.
Rooftopping is the heart-stopping photography movement which involves thrill seekers climbing to the top of city skyscrapers, hanging off the edge and taking pictures of the spectacular view beneath them.
Photographer Tom Ryaboi is one of the crusaders of Rooftopping. The 27-year-old, from Toronto in Canada, has climbed more than 100 buildings and produced some of the most stunning examples of the craze.
Above the world: The stunning photography shots produce amazing results but photographers have to go to extreme lengths to capture the images
He said: 'It's addictive and I am always looking for a higher roof in the city. But I still feel the buzz whenever I reach the top and feel the wind. It's a pure rush of adrenaline.'
Disguising themselves so they can carry out their daring stunts, the thrill seekers avoid security and CCTV before climbing to the top of skyscrapers and hanging off the edge - photographing the evidence as proof of their antics.
Tom added: 'I try to blend in as much as possible. In an office building I dress like I work there, on a construction site I dress like the workmen.
'It's in my blood. When I was a child one day, my dad came home from work and found me sitting on top of the fridge.
'They had no idea how I had got there, but obviously I just liked climbing things.'
Risky business: Photographer Tom Ryaboi (pictured) has climbed more than 100 buildings and produced some of the most stunning examples of Rooftopping to date
Growing in popularity: Using the internet to spread his new found love of storming skyscraper roofs, Tom has now inspired other Rooftoppers to start climbing too
Birds eye view: Rooftoppers avoid security, CCTV and risk their lives on top of the windy ledges up to almost 1,000 feet high
Having spent the past four years on top of Canada's largest city's roofs, Tom enjoys the isolation he feels hundreds of feet above the pavement.
He added: 'I've been on the top three tallest buildings in Toronto. But I often tell people it's not really the height the matters.
'The coolest views are often from lower buildings nestled in between the tall ones.
Vertiginous: A dedicated few 'Rooftoppers' are determined to climb to the top of every skyscraper roof in their city, hang off the edge and photograph the evidence as proof
'You really get a sense you're in the urban 'jungle' then, surrounded by this forest of concrete, steel and glass.
Using the internet to spread his new found love of storming skyscraper roofs, Tom has now inspired other rooftoppers to start climbing too.
'I'm not the first in the world, but I've introduced about 20 people to rooftopping and now groups of men and women are all trying to do it.'
Don't look down: On lower buildings, Tom says you get a sense of being in an urban 'jungle', surrounded by a forest of concrete, steel and glass
Dangerous and daring: A Rooftopper climbs up an open structure in a bid to get the perfect shot
Long way down: Tom, pictured from behind to protect his identity, peers out across the cityscape high above the streets of Toronto
Easy does it: A Rooftopper inches his way to the edge of the building (left) while another climbs up a ladder (right) in a bid to reach the perfect vantage point
Concrete jungle: Tom says he enjoys the isolation he feels hundreds of feet above the pavement