Stop what you’re doing right now and look at photographer Rüdiger Nehmzow’s collection of photos of clouds. These photographs aren’t just your typical point-the-camera-at-the-sky and shoot images. No, these are shot while Nehmzow was about 4 miles (or more) up in the air in the open door of an airplane. The air was so thin there that Nehmzow had to wear an oxygen mask.

All photos by Rüdiger Nehmzow

Hit the 4 and a half minute mark in the video below if you want to see Rüdiger Nehmzow doing his thing. Then check out his website for more images.