I'm playing with prototyping techniques and created a prototype using a storyboard.

Design Thinking stole the storyboard idea from screenwriters who use storyboards to lay out their scenes and check for dramatic elements.
Here's what I learned from my storyboard experiment.
First, it's fast and easy to draw a storyboard. All you need to draw is a sharpie and sticky notes.
You don't have to be an artist, stick figures are fine.
The story can use dramatic elements from screenwriting. In fact, I use some of the beats from the Save the Cat Beat Sheet. There's an upset CEO, the catalyst beat. And I use an opening and closing image. The CEO is happy at the end of the story.
In short, Design Thinking has the fastest feedback loop of any of the Agile or Lean approaches. Employ prototyping techniques to get fast feedback from your customers and build products that customers love.
Ideate; Prototype; Iterate