Click the green flag, and then adjust the sliders to make different patterns. Click the Draw button to watch the pattern being drawn. Click the Play button to watch the pattern morph into other patterns. Click the Dice button to randomize the sliders.
Thanks to @crkcity, whose recent Vertigo-themed projects gave me this idea. Especially the project "Lissajous patterns": https://scratch.mit.edu/projects/609562909/ It doesn't quite look like the patterns in the Vertigo opening titles though, so I tried to find information about how they were accomplished. I quickly found two articles stating that John Whitney - the man who made the animations - used a rotating table when drawing them: https://computeranimationhistory-cgi.jimdofree.com/vertigo/ https://rhizome.org/editorial/2013/may/9/did-vertigo-introduce-computer-graphics-cinema/ In Scratch, the backdrop can't be rotated, so I decided to rotate the position of the pen instead. Luckily, @MathMathMath's tutorial project "2D Part 6: Rotation" helped me do just that: https://scratch.mit.edu/projects/169473701/ In the end, I wasn't able to replicate the patterns in the Vertigo opening title, but I discovered a range of other interesting patterns instead :)
