Artist Christ McCaw uses the intense light of the sun to literally burn in the exposure of his photographs. It all started when he overslept while taking a long night exposure and the resulting image had burn marks from where the sun was rising. He used that idea, and decided to make dedicated exposures of the process. It’s neat how you can see when heavy clouds came in and stopped the burning, and when the intense sun bled the burning around the edges.
He decided to travel to Alaska, where in the summer, the sun is perpetually in the sky. Over the course of many days, he took various long exposure shots and was able to show the continuous arc of the sun. Again, it’s pretty neat, you should check out his other work.