Dr. Drang:

All those green bubbles come from a single Magic Variable and its many parts. I’m going to show how to put them together—partly because it might help you, but mostly in the hope that doing this will reinforce the use of Magic Variables with me.

The introduction of Magic Variables in version 1.7 of the Workflow app was supposed to make the use of variables easier. Magic Variables never clicked with me, though, probably because I never spent the time to understand them. I finally grasp how to use them, thanks to this post by Dr. Drang. If you want to use Magic Variables in the Shortcuts app (the successor to the Workflow app), Dr. Drang’s post is a great place to start.