The BBC has a series of pictures taken by pinhole camera at http://www.bbc.co.uk/news/in-pictures-27221895
Image 7 is described thus: John Rigg: "This is a six-month exposure using a pinhole camera made from an empty soup tin and photographic paper, not film. The resulting image is then scanned and reversed. The trails mark the path of the sun across the sky as the seasons change. Days with broken cloud show as a dotted line.” -- Barry --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
