Watch. Please leave a comment, favorite, and love. If you stare at this, at first things will look as if the Helix is just spinning normally. If you stare at one side, things might look as if the Helix is narrowing and making both sides switch. You might even be able to find more patterns! One thing to learn from this: If you are doing a project that consists of many similar sprites, see if you can use clones instead. To mess around with how the helix can twist, click See Inside, and in the first When Green Flag Clicked code, find the "change point in direction[number]" and replace number with any number!
Check out https://scratch.mit.edu/projects/371464/#player. He did a basically same project, but not a efficient as mine (No offense to him). Its actually not just him, but most of everybody that do things like this, they don't use clones either. Look in the scripts and see if you can figure it out. Sorry if the music doesn't fit.