Paul Williams / View from plane of eroded salt dome, Kavir Desert, Iran, December.

Tony Heald / Giraffes {Giraffa camelopardalis}, Etosha NP, Namibia

Yva Momatiuk & John Eastcott / Impala (Aepyceros melampus) male at waterhole, with reflection of another male creating an optical illusion, Etosha National Park, Namibia

Yva Momatiuk & John Eastcott / Impala (Aepyceros melampus) females drinking at waterhole in dry season, with reflection of male creating an optical illusion, Etosha National Park, Namibia

Andy Sands / Ant damsel bug (Himacerus mirmicoides) late instar nymph that mimics ant by having white second and thirds abdominal segments giving the illusion of a narrow waist, Surrey, England, UK, July

Andy Sands / Ant damsel bug (Himacerus mirmicoides) late instar nymph that mimics ant by having white second and thirds abdominal segments giving the illusion of a narrow waist, Surrey, England, UK, July

LYNN M. STONE / Wolf's Gueonon Monkey (Cercopithecus pogonias wolfi) against a black background, captive from Congo, Rwanda and Uganda. Non-ex

Bryan and Cherry Alexander / Painting on the side of a house creating illusion of passageway, Punta Arenas, Chile, January 2006.

Hanne & Jens Eriksen / Heat haze on the horizon, Barr Al Hikman, Oman

Constantinos Petrinos / Broadclub cuttlefish {Sepia latimanus} deimatic display, defence, gives illusion of

Henley Spiers / Broadclub cuttlefish (Sepia latimanus) with a reflected swirl of colour, Gato Island, Cebu, Philippines, Pacific Ocean.

Mark Taylor / Forced Perspective photo of a giant in the saltflats of Salar de Uyuni, Bolivia.