That would be a solargraph. It "shows the path taken by the sun as it travelled across the sky above the Clifton Suspension Bridge in Bristol, UK, between 19 December 2007 and 21 June 2008 - the winter and summer solstices. It was taken in a single six-month exposure by photographer Justin Quinnell, using a pinhole camera strapped to a telephone mast."
See the other images here.
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That's wonderful. Great find. And welcome back.