I got a little bored at the airport

Cross viewing is seeing 3D with nothing but your regular screen! The pictures here show two perspectives, just cross your eyes and make the two sides overlap to see the image in 3D. Make sure you're crossing your eyes and not relaxing them! Check the "new users" pinned post to be sure. Tutorials and helpful apps on the sidebar/wiki/menu/about. Accepting submissions of all forms (pictures, gif/gfys, videos). If things look 'reverse depth' then /r/ParallelView might be the place for you!