tools, technology, work
Detail of a fresnel lens designed by David Stevenson for Inchkeith Lighthouse at the end of the 19th century, and now part of the National Museum of Scotland on Chambers Street in Edinburgh.
This first order dioptric holophotal revolving light showed a flash every half minute and made one complete revolution in four minutes.
Silver and glass tea set for sale in one of the shops along the Plaza Santa Ana in Granada.
Dappled sunlight through the stained glass on the stone tracery above the apse of the Saint Bavo Cathedral (also known as Sint-Baafs Cathedral, or Sint Baafskathedraal in Dutch), Ghent, Flanders.
The glass front of the lobby of the Saxo Bank building, Copenhagen, Denmark.