Keyword(s): Visby

A view of Gotland
Personal photoblog, my way of expressing artistic
Early attempts at making aspheric lenses to correct spherical aberration were made by Ren?? Descartes in the 1620s, and by Constantijn Huygens in the 1630s. The Visby lenses produced by Vikings on the island of Gotland in the 10th or 11th century...

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