Illusions and impossible figures
Much information about different illusions. Something about Oscar Reutervard, M. C. Escher and others (English)
Very large collection of images with illusions and impossible fogures. Many pictures by famous artists. (English and dutch languages)
Bug collection of imassible figures in fine environment. Animations and Java-applets. (English)
Collection with impossible figures. (Russian and english languages) (NEW)
Large collection of impossible figures (Hungarian language) (NEW)
Large website about illusions (French) (NEW)
Large collection of illusions and impossible figures including (Russian) (NEW)
A site about illusions - an english variation of the site above (English)

M. C. Escher
Big gallery with Escher's artworks, competitions, electronic shop etc. (English)
Official M. C. Escher website (English)
The one of the biggest bug collection of Eschers's artworks in Internet (English)
Detailed Escher's bigraphy (English)
Escher's web-gallery (Russian language)
Collection of rare Escher's artworks 

Oscar Reutersvard
Much original images by Oscar Reutersvard. (Italian language)
Oscar Reutersvard's black and white pencil images and color litographies. Electronic postcards with Reutersvard's images (English and swedich languages)
Big collection of Escher's, Sandro del Prete's and Reutersvard's images. (English)
Article about Reutersvard and some of his images. (English)
Article about Reutersvard in newspaper "Uchitelskaya Gaseta". (Russian language)
Few images by Reutersvard. (Swedish language)
Collection of copies Reutervard's images. (English)

Sandro del Prete
Official Sandro del Prete's site. (English)
Leonardo On-line gallery. Collection of images by Sandro del Prete, Jos de Mey, Istvan Orovits and others. (English)
Sandro del Prete's biography. Delivery of electronic postcards with del Prete's images. (English)

Istvan Orosz
Istvan Orosz's website. (English)
Three artworks by Orosz with well quality. (Hungarian language)
Extensive collection of images by Orosz. (English)

Miscellaneous (NEW)
Official website of Irvine Peacock (English) 
Fine renering of common impossible figures. (Russian language)
Website of russian artist Dmitry Rakov. (Russian and english languages) (NEW)
Website of russian artist Igor Achkasov (Russian and english languages)
Website of german artist Guenter Albrecht-Buehler (English)
About mathematical art. (Dutch language)
A small book about impossible figures. (English and german language)
Sir Roger Penrose society. Much links to useful mathematic sites. (English)
Article about impossible triangle. (English)
Article at electronic magazine "Computer News On-line" about illusions. (Russian language)

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