I've had a long term interest in visualization -- mostly implementing other people's designs. I don't believe that all visual tools need to be intuitive; many will need training to use effectively. I think this one is on the edge between intuitive and training needed.
This Widget Forces You to Think - YouTube
I don't know if the game Star Wars: Outer Rim is enjoyable, but the game's physical design is amazing. Which reminds me I have What the Tech World Can Learn from Video Game UX lined up to watch.
Update: The video was about using gamification to enhance learning to use a handheld ultrasound scanner. Nothing new.