Ross Hoddinott / Vehicle tracks in field of ripe Barley, farmland, late evening light, near Putford, Devon, UK. August 2012.

Luke Massey / 2020VISION / Little owl (Athene noctua) perched on a rusting iron wheel, Essex, England, UK, June.

Luke Massey / 2020VISION / Little owl (Athene noctua) perched on a rusting iron wheel, Essex, England, UK, June.

Peter Cairns / 2020VISION / Rusting remains of mussel processing machine, Campfield Marsh RSPB reserve, Solway Firth, Cumbria, UK, April 2011

Laurent Geslin / Kingfisher (Alcedo atthis) perching on the wheel of a shopping trolley in the heart of a city.

Steven Kazlowski / Petroglyphs on Newspaper Rock, a boulder in Canyonlands National Park, Utah, USA. 2009.

Gavin Hellier / Millennium Ferris Wheel - London Eye and Big Ben, illuminated at night, London, UK 2008

Gavin Hellier / Millennium Ferris Wheel - London Eye and Big Ben, silhouetted at sunset, London, UK 2008

Gavin Hellier / Millennium Ferris Wheel - London Eye and Big Ben, silhouetted at sunset, London, UK 2008

Gavin Hellier / Millennium Ferris Wheel - London Eye and Big Ben, silhouetted at sunset, London, UK 2008

Gavin Hellier / Millennium Ferris Wheel - London Eye and Big Ben, silhouetted at sunset, London, UK 2008

Gavin Hellier / Millennium Ferris Wheel - London Eye and Big Ben, silhouetted at sunset, London, UK 2008

Gavin Hellier / Millennium Ferris Wheel - London Eye and Big Ben, silhouetted at sunset, London, UK 2008

Gavin Hellier / Millennium Ferris Wheel - London Eye and Big Ben, illuminated at night, London, UK 2008

Gavin Hellier / Fishermans Wharf sign at San Francisco, California, USA 2011

Alex Hyde / The Wheel Stones (also known as the Coach and Horses) on Derwent Edge in winter conditions, Peak District National Park, Derbyshire, UK. January.

Alex Hyde / The Wheel Stones (also known as the Coach and Horses) on Derwent Edge in winter conditions, Peak District National Park, Derbyshire, UK. January.

Alex Hyde / The Wheel Stones (also known as the Coach and Horses) on Derwent Edge in winter conditions, Peak District National Park, Derbyshire, UK. January.

Alex Hyde / Sunrise over White Tor on Derwent Edge, looking on towards the Wheel Stones. Peak District National Park, January.

Alex Hyde / Sunrise on Derwent Edge, looking on towards the Wheel Stones. Peak District National Park, January.

Alex Hyde / Sunrise over White Tor on Derwent Edge, looking on towards the Wheel Stones. Peak District National Park, January.

Ann & Steve Toon / Hedgehog (Erinaceus europaeus), at risk by car wheel, controlled conditions, captive, England, March

Ann & Steve Toon / Hedgehog (Erinaceus europaeus, at risk by car wheel, controlled conditions, captive, England, March

David Tipling / Red squirrel (Sciurus vulgaris) on wheel of snow plough, Oulu, Finland, March

Luke Massey / 2020VISION / Little owl (Athene noctua) perched on a rusting iron wheel, Essex, England, UK, June.

Enrique Lopez-Tapia / Close-up of the front wheel of a bicycle taxi, Dhaka, Bangladesh, June 2012.

Ernie Janes / Corn Chamomile (Anthemis arvensis) in flower surrounding a discarded old farm implement wheel, Norfolk, UK, June

Enrique Lopez-Tapia / Buddhist prayer wheels with old Nescafe tin replacing traditions wheel, Manang (3.540m). Annapurna Conservation Area, Himalayas, Nepal, October 2009.

Enrique Lopez-Tapia / Golden wheel / Cartwheeling spider (Carparachne aureoflava), Namib desert, Namibia, November

Rolf Nussbaumer / Indian blanket / Fire wheel (Gaillardia pulchella) close up of flower head, Dinero, Lake Corpus Christi, South Texas, USA.

Benoit Stichelbaut / Steering wheel aboard 118ft schooner "Magistral". France 2002.

Benoit Stichelbaut / Wooden steering wheel and compass upon yacht

Merryn Thomas / Spectators aboard "Enterprise III" ferry at the Funchal 500 Tall Ships Regatta race day, Saturday 13th September 2008. Falmouth, Cornwall, UK

Merryn Thomas / Wheelhouse and bunting on the "Enterprise III" ferry at the Funchal 500 Tall Ships Regatta race day, Saturday 13th September 2008. Falmouth, Cornwall, UK

John Cancalosi / Cog Wheel Assassin Bug (Arilus carinatus). Costa Rica, Central America.

John Cancalosi / Cog Wheel Assassin Bug (Arilus carinatus). Costa Rica, Central America

John Cancalosi / Cog Wheel Assassin Bug (Arilus carinatus). Costa Rica, Central America.

LYNN M. STONE / Ruby meadowhawk dragonfly (Sympetrum rubicundulum) pair in mating embrace known as a wheel, East Haddam, Connecticut, USA, July

Ernie Janes / Rusty old hayturner wheel in wildflower meadow, Buckinghshire, UK

Rolf Nussbaumer / Familiar Bluet (Enallagma civile) pair mating on grass forming a 'mating wheel'. Laredo, Webb County, South Texas, USA, April.

Ernie Janes / Corn Chamomile (Anthemis arvensis), Corncockle (Agrostema githago) and common Poppy (Papaver rhoeas) flowering in meadow with old metal wheel structure, UK

Ernie Janes / Blackbird (Turdus merula) male perched on rusty wheel, UK, April

Ernie Janes / Rusty card wheel amongst flowering Daisies (Bellis perennis) Buckinghamshire, UK

Peter Cairns / 2020VISION / Rusting remains of mussel processing machine with flowering gorse in foreground, Campfield Marsh RSPB reserve, Solway Firth, Cumbria, UK, April 2011

Pete Oxford / Cog-wheel Assassin Bug (Arilus carinatus). Mindo cloudforest. West slope of the Andes, Ecuador, September.

Pete Oxford / Cog-wheel Assassin Bug (Arilus carinatus). Mindo cloud forest, Ecuador.

Pete Oxford / Cog-wheel Assassin Bug (Arilus carinatus). Mindo cloud forest, Ecuador.

Bernard Castelein / Buddhist pilgrim sitting by a prayer wheel in Galdan Namge Lhatse monastery. Tawang, Arunachal Pradesh, India, February 2011.

Hermann Brehm / A pair of Ruddy Darter Dragonflies (Sympetrum sanguineum) forming a mating wheel. The male is red. Bavaria, Germany, August.

Peter Cairns / 2020VISION / Pete Cairns, photographer, beside four-wheel drive vehicle in Silver birch (Betula pendula) woodland in winter, Glenfeshie, Cairngorms NP, Highlands, Scotland, UK, December 2010

Ernie Janes / Pet Hamster (Mesocricetus auratus) in exercise wheel, studio shot

Pete Oxford / Cog-wheel Assasin Bug (Arilus carinatus) with prey, Mindo Cloud Forest, western slope of Andes, Ecuador

Onne van der Wal / Four wheel drive vehicle entering a river in the Lakes region of central Chile, 2008.

Onne van der Wal / Four wheel drive vehicle driving under low trees in the Lakes region of central Chile, 2008.

GEORGETTE DOUWMA / Assassin bug / Wheel bug (Arilus cristatus) Tennessee, USA.

Sven Zacek / Four wheel drive car driving along wet road, spraying muddy water, Subaru legacy, Estonia

Alex Hyde / Derwent Edge at dawn, with heather (Erica sp) in bloom. The Wheel Stones can be seen to the right. Peak District National Park, England. September 2009.

Angelo Gandolfi / Roe deer (Capreolus capreolus) investigating evergreen clippings left in wheelbarrow in suburban garden. Piemonte, Italy.

Angelo Gandolfi / Roe deer (Capreolus capreolus) investigating evergreen clippings left in wheelbarrow in suburban garden. Male left, female right. Piemonte, Italy.

Nick Upton / Banded demoiselle damselflies (Calopteryx splendens) fanning wings as they mate in the wheel position, Wiltshire, UK, May

Nick Upton / Male Banded demoiselle damselfly (Calopteryx splendens) gripping female with tail claspers as she prepares to mate in wheel position, Wiltshire, UK, May

Michael Hutchinson / Azure Damselfly (Coenagrion puella) male and female in mating wheel on grass stem, Bristol, UK

GEORGETTE DOUWMA / Assassin bug / Wheel bug (Arilus cristatus). It gets its name from a structure on its thorax which resembles a gear or saw blade. The wheel bug is notorious for its painful bite, but it only bites by...

Edwin Giesbers / Four wheel drive safari with tourists watching wildlife in the Ngorongoro crater, Tanzania, February 2009

Solvin Zankl / Golden wheel spider / Dancing white lady (Carparachne aureoflava) on sand dune, Namib Desert, Namibia

Kirkendall-Spring / Detail of wagon at historic Harmony Borax Works in Death Valley National Park, California, USA

Peter Lewis / The London Eye Millenium Wheel, 443ft high, the biggest Ferris Wheel in Europe, it has become the most popular paid tourist attraction in the United Kingdom, London, UK

Peter Lewis / The London Eye Millenium Wheel, 443ft high, the biggest Ferris Wheel in Europe, it has become the most popular paid tourist attraction in the United Kingdom, London, UK

Peter Lewis / The London Eye Millenium Wheel, 443ft high, the biggest Ferris Wheel in Europe, it has become the most popular paid tourist attraction in the United Kingdom, London, UK

Solvin Zankl / The Golden Wheel Spider (Carparachne aureoflava) rolling down sand dune to escape its predator, a pompilid wasp, Namib Desert, Namibia

Kerstin Hinze / Woman with a wheel barrow loaded with leaves of White Mulberry (Morus alba) for feeding the silkworms (Bombyx mori) for silk production, Zernikow, Brandenburg, Germany. July 2007

Solvin Zankl / Golden Wheel Spider (Carparachne aureoflava) at entrance to burrow which can extend 40 - 50 cm into the sand, Namib desert, Namibia

Solvin Zankl / Golden Wheel Spider (Carparachne aureoflava) at entrance to burrow which can extend 40 - 50 cm into the sand, Namib desert, Namibia

Solvin Zankl / Golden Wheel Spider (Carparachne aureoflava) at entrance to burrow which can extend 40 - 50 cm into the sand, Namib desert, Namibia

Solvin Zankl / Golden Wheel Spider (Carparachne aureoflava) excavating entrance to burrow which can extend 40 - 50 cm into the sand, Namib desert, Namibia

Solvin Zankl / Pompilid wasp {Pompilidae} digging hole in sand to reach the Golden wheel spider in its burrow beneath the sand, Namib desert, Namibia

Solvin Zankl / The Golden Wheel Spider (Carparachne aureoflava) feeding on insect prey, Namib desert, Namibia

Gary K. Smith / Small garden pond with rustic wheel feature and waterfall, Norfolk, UK

Bernard Castelein / Buddhist giant prayer wheel in Tashiding Monastery, Sikkim, India October 2007

Bernard Castelein / Woman holding prayer wheel in Tashiding Monastery, Sikkim, India October 2007

Bernard Castelein / Buddhist Mantra wheel carved in stone, near Kechopari Lake, Sikkim, India October 2007

Bernard Castelein / Buddhist mantra wheel carved in stone in front of Pemayanste Monastery, Pelling, Sikkim, India October 2007

Bernard Castelein / Women using prayer wheel in Tashiding Monastery beside prayer flags, Sikkim, India October 2007

Dave Bevan / Woman forking well-rotted leaf mold from a big bag into a wheel barrow, UK, model released

Steve Knell / Azure damselfly (Coenagrion puella) pair in wheel position, UK

Jane Burton / Skewbald Mouse {Mus genus} running in activity wheel

Jane Burton / Chinese Hamster {Cricetulus barabensis} running in activity wheel

Jane Burton / Agouti tame Rat {Rattus sp} climbing in exercise wheel

Pete Oxford / Largest Buddhist prayer wheel in the world, Zhongdian, Deqin Tibetan Autonymous Prefecture, Yunnan Province, China 2006

Pete Oxford / Largest Buddhist prayer wheel in the world, Zhongdian, Deqin Tibetan Autonymous Prefecture, Yunnan Province, China 2006

Pete Oxford / Four wheel dirve vehicle on a narrow road / track, Nu River Canyon near Gongshan in Dulongjiang Prefecturate, Yunnan Province, China 2006

Bernard Castelein / Buddhist woman spinning prayer wheel in Galdan Namge Lhatse monastery / Golden Age Lhatse monastery, Tawang, Arunachal Pradesh, India 2005

Bernard Castelein / Monpa woman with typical headdress spinning prayer wheel, Tawang, Arunachal Pradesh, India 2005

Bernard Castelein / Young buddhist monk using prayer wheel in Galdan Namge Lhatse monastery / Golden Age Lhatse monastery, Tawang, Arunachal Pradesh, India 2005

Bernard Castelein / Buddhist woman spinning prayer wheel in Galdan Namge Lhatse monastery / Golden Age Lhatse monastery, Tawang, Arunachal Pradesh, India 2005

Mark Raycroft / Keeshond (Canis familiaris) puppy and wagon wheel