via Solargraphy

I came across this interesting version of pinhole photography, called Solargraphy: Photos that are not taken over seconds, but in weeks or even months. The sun draws lines over the sky, showing its seasonal shifting from day to day. Beautiful and eerie images with elegant lines emerge. I collected some of my favorites.

via Solargraphy

via Kwerfeldein

via flickr (click on image to go to the flickr page)