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Aerial view of Le Morne Brabant and the Underwater Waterfall optical illusion and natural phenomena, Mauritius, Indian Ocean, Africa

Addis Ababa, Ethiopia - Arabica coffee beans being graded by an optical coffee sorter at Oromia Coffee Farmers Cooperative.

Using refractive telescope to select optical correction in spectacle lenses. Masked patient and doctor - Covid 19.

The boy is the patient on reception at doctor ophthalmologist. Diagnostic ophthalmologic equipment. Medicine concept.

Using refractive telescope to select optical correction in spectacle lenses. Masked patient and doctor - Covid 19.

The boy is the patient on reception at doctor ophthalmologist. Diagnostic ophthalmologic equipment. Medicine concept.

Using refractive telescope to select optical correction in spectacle lenses. Masked patient and doctor - Covid 19.

The boy is the patient on reception at doctor ophthalmologist. Diagnostic ophthalmologic equipment. Medicine concept.

Using refractive telescope to select optical correction in spectacle lenses. Masked patient and doctor - Covid 19.

View over the cloud cover with Nordic Optical Telescope observatory, astronomical telescope, Roque de los Muchachos Observatory or Observatorio del Roque de los Muchachos or ORM, Mt. Roque de los Muchachos, volcanic island of La Palma, La Isla Verde, La I

Optical illusion, man holds off-roader on hand, Salar de Uyuni, Uyuni, Potosi, Bolivia, South America

View over the cloud cover with Nordic Optical Telescope observatory, astronomical telescope, Roque de los Muchachos Observatory or Observatorio del Roque de los Muchachos or ORM, Mt. Roque de los Muchachos, volcanic island of La Palma, La Isla Verde, La I

Center for Photonics and Optical Technologies, Photonics Center, Humboldt-Universitaet university, Wissenschaftsstadt Adlershof Science City, Berlin, Germany, Europe

Arched ceiling, ceiling painting, 1703, by Andrea Pozzo, creating a perspective optical illusion, Jesuitenkirche church, Doktor-Ignaz-Seipel-Platz square 1, Vienna, Austria, Europe

View over the cloud cover with Nordic Optical Telescope observatory, astronomical telescope, Roque de los Muchachos Observatory or Observatorio del Roque de los Muchachos or ORM, Mt. Roque de los Muchachos, volcanic island of La Palma, La Isla Verde, La I

Center for Photonics and Optical Technologies, Photonics Center, Humboldt-Universitaet university, Wissenschaftsstadt Adlershof Science City, Berlin, Germany, Europe

Center for Photonics and Optical Technologies, Photonics Center, Humboldt-Universitaet university, Wissenschaftsstadt Adlershof Science City, Berlin, Germany, Europe

Optical illusion, floor, mosaic, Lateran Basilica, Basilica di San Giovanni in Laterano, historic city centre, Rome, Italy, Europe

Center for Photonics and Optical Technologies, Photonics Center, Humboldt-Universitaet university, Wissenschaftsstadt Adlershof Science City, Berlin, Germany, Europe

Plune Castle, owned by the Fielmann AG optical company, Ploen district, Holsteinische Schweiz Nature Reserve, Schleswig-Holstein, Germany, Europe

Plune Castle, owned by the Fielmann AG optical company, Ploen district, Holsteinische Schweiz Nature Reserve, Schleswig-Holstein, Germany, Europe

Plune Castle, owned by the Fielmann AG optical company, Ploen district, Holsteinische Schweiz Nature Reserve, Schleswig-Holstein, Germany, Europe