If you enjoy sun+magnifying glass based artworks, check out the exceedingly awesome Solar Totems by Charles Sowers in Glen Park, San Francisco: http://charlessowers.com/solar-totems
Each day the sun’s path in burned into a line on a holllowed-out log. The lens moves up an inch or so each day. In previous lines, you can see the length of the days, and which days were sunny or clouds. Solstices and eclipses are marked on last year’s log.
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