OK I don't really know what this is. Just some random thing I guess. Press space.
All I did was make 2 lines and then copy and paste it a ton of times, then copy all those, paste them, and flip them over. And then I moved them up, down, left, or right VERY slightly. Then all this just came into existence. I realized that when you see it on the thumbnail before clicking the project it looks a lot different lol.