So basically what the camera obscura means is that someone has a canvas in a completely dark room. I'm talkin- a room that is sealed all, no hole, no cracks, no crannies (whatever a cranny is?). And with this dark room, the artist figures out where to pop a tiny hole in a wall. This tiny hole only lets enough light in to the complete black room that the actual image of the outside is projected onto the canvas. How cool is that? Here's a picture explaining.
So it was a cheaters way of painting, or alot of smart men that made alot of easy money.
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