I might have said something in previous posts about artists having to sit for hours while painting a scene or portrait, but I have learned about camera obscura from a YouTube video produced by the National Gallery in London. The curator discussed camera obscura in connection with Canaletto (1697-1768).
With a camera obscura, one can capture the world by projecting what is on the outside down into a darkened space on the inside and use what is captured back in the studio. For more about camera obscura, check out Wikipedia. Recently, I completed a Wikipedia survey on how I use the site.
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